{"id":299231,"date":"2023-12-23T16:55:31","date_gmt":"2023-12-23T09:55:31","guid":{"rendered":"https:\/\/hoanghamobile.com\/tin-tuc\/?p=299231"},"modified":"2023-12-23T16:55:31","modified_gmt":"2023-12-23T09:55:31","slug":"so-nguyen-to-la-gi","status":"publish","type":"post","link":"https:\/\/hoanghamobile.com\/tin-tuc\/so-nguyen-to-la-gi\/","title":{"rendered":"S\u1ed1 nguy\u00ean t\u1ed1 l\u00e0 g\u00ec? V\u00ed d\u1ee5 minh h\u1ecda, t\u00ednh ch\u1ea5t, b\u1ea3ng s\u1ed1 nguy\u00ean t\u1ed1"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">S\u1ed1 nguy\u00ean t\u1ed1 l\u00e0 g\u00ec? \u0110\u00e2y l\u00e0 m\u1ed9t \u0111\u1ecbnh ngh\u0129a m\u00e0 h\u1ea7u h\u1ebft nh\u1eefng h\u1ecdc sinh hi\u1ec7n nay \u0111\u1ec1u ph\u1ea3i n\u1eafm \u0111\u1ec3 gi\u1ea3i b\u00e0i t\u1eadp to\u00e1n ch\u00ednh x\u00e1c. \u0110\u00e2y c\u0169ng l\u00e0 ki\u1ebfn th\u1ee9c l\u00e0m n\u1ec1n t\u1ea3ng \u0111\u1ec3 c\u00e1c b\u1ea1n c\u00f3 th\u1ec3 l\u00e0m t\u1ed1t nh\u1eefng b\u00e0i ki\u1ec3m tra, b\u00e0i thi quan tr\u1ecdng. V\u1eady th\u00ec b\u00e0i vi\u1ebft sau s\u1ebd chia s\u1ebb r\u00f5 h\u01a1n v\u1ec1 s\u1ed1 nguy\u00ean t\u1ed1 v\u00e0 nh\u1eefng \u0111\u1eb7c tr\u01b0ng c\u1ee7a n\u00f3 cho c\u00e1c b\u1ea1n c\u00f9ng t\u00ecm hi\u1ec3u.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">\u0110\u1ecbnh ngh\u0129a s\u1ed1 nguy\u00ean t\u1ed1 l\u00e0 g\u00ec?\u00a0<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">S\u1ed1 nguy\u00ean t\u1ed1 \u0111\u01b0\u1ee3c hi\u1ec3u l\u00e0 t\u1ed5 h\u1ee3p c\u00e1c s\u1ed1 t\u1ef1 nhi\u00ean c\u00f3 th\u1ec3 chia h\u1ebft cho s\u1ed1 1 v\u00e0 chia h\u1ebft cho ch\u00ednh b\u1ea3n th\u00e2n n\u00f3. Ch\u00fang ta d\u1ec5 d\u00e0ng hi\u1ec3u \u0111\u01b0\u1ee3c s\u1ed1 nguy\u00ean t\u1ed1 l\u00e0 s\u1ed1 trong s\u1ed1 t\u1ef1 nhi\u00ean c\u00f3 gi\u00e1 tr\u1ecb cao h\u01a1n 1, ngo\u00e0i vi\u1ec7c chia h\u1ebft cho s\u1ed1 1 v\u00e0 chia h\u1ebft cho ch\u00ednh n\u00f3 th\u00ec s\u1ed1 nguy\u00ean t\u1ed1 kh\u00f4ng c\u00f3 kh\u1ea3 n\u0103ng chia h\u1ebft cho b\u1ea5t c\u1ee9 s\u1ed1 n\u00e0o n\u1eefa.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">N\u1ebfu trong to\u00e1n h\u1ecdc c\u00f3 1 s\u1ed1 c\u00f3 th\u1ec3 chia h\u1ebft cho 1 s\u1ed1 kh\u00e1c ngo\u00e0i chia h\u1ebft cho ch\u00ednh n\u00f3 v\u00e0 chia h\u1ebft cho s\u1ed1 1 th\u00ec s\u1ed1 \u0111\u00f3 \u0111\u01b0\u1ee3c coi nh\u01b0 h\u1ee3p s\u1ed1. \u0110\u1ec3 hi\u1ec3u h\u01a1n th\u00ec b\u1ea1n c\u00f3 th\u1ec3 t\u00ecm hi\u1ec3u m\u1ed9t v\u00ed d\u1ee5 v\u1ec1 s\u1ed1 nguy\u00ean t\u1ed1 11.<\/span><\/p>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/so-nguyen-to-la-gi-2.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/so-nguyen-to-la-gi-2-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/so-nguyen-to-la-gi-2-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img fetchpriority=\"high\" decoding=\"async\" class=\"size-full wp-image-299246 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/so-nguyen-to-la-gi-2.jpg\" alt=\"so-nguyen-to-la-gi-2\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/so-nguyen-to-la-gi-2.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/so-nguyen-to-la-gi-2-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/so-nguyen-to-la-gi-2-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<p><span style=\"font-weight: 400;\">B\u1ea1n h\u00e3y t\u01b0\u1edfng t\u01b0\u1ee3ng m\u00ecnh \u0111ang s\u1edf h\u1eefu 11 qu\u1ea3 l\u00ea v\u00e0 b\u1ea1n c\u1ea7n chia s\u1ed1 qu\u1ea3 t\u00e1o n\u00e0y \u0111\u1ed3ng \u0111\u1ec1u cho b\u1ea1n c\u1ee7a m\u00ecnh (b\u1eb1ng ho\u1eb7c l\u1edbn h\u01a1n hai), ch\u1eb3ng h\u1ea1n nh\u01b0 chia cho 5 ng\u01b0\u1eddi. L\u00fac n\u00e0y b\u1ea1n kh\u00f4ng th\u1ec3 ph\u00e2n chia \u0111\u1ed3ng \u0111\u1ec1u 11 qu\u1ea3 l\u00ea n\u00e0y cho 5 b\u1ea1n \u0111\u01b0\u1ee3c v\u00ec s\u1ed1 11 l\u00e0 s\u1ed1 nguy\u00ean t\u1ed1 v\u00e0 n\u00f3 ch\u1ec9 c\u00f3 th\u1ec3 chia cho 11 v\u00e0 s\u1ed1 1 m\u00e0 th\u00f4i.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">V\u1eady \u1ee9ng d\u1ee5ng c\u1ee7a s\u1ed1 nguy\u00ean t\u1ed1 l\u00e0 g\u00ec? Hi\u1ec7n nay s\u1ed1 nguy\u00ean t\u1ed1 \u0111ang \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng nhi\u1ec1u trong to\u00e1n h\u1ecdc v\u00e0 n\u00f3 c\u00f3 m\u1ed1i li\u00ean h\u1ec7 tr\u1ef1c ti\u1ebfp v\u1edbi nh\u1eefng ph\u01b0\u01a1ng ph\u00e1p t\u00ecm \u01b0\u1edbc chung b\u00e9 nh\u1ea5t. C\u00f2n trong l\u0129nh v\u1ef1c v\u0103n h\u1ecdc th\u00ec s\u1ed1 nguy\u00ean t\u1ed1 l\u1ea1i \u0111\u1ea1i di\u1ec7n cho c\u00f4 \u0111\u01a1n. Nh\u1eefng s\u1ed1 nguy\u00ean t\u1ed1 d\u00f9 r\u1ea5t s\u00e1t nhau nh\u01b0ng v\u1eabn b\u1ecb t\u00e1ch bi\u1ec7t v\u00ec nh\u1eefng s\u1ed1 ch\u1eb5n nh\u01b0 3, 5, 7, 9. V\u00ec v\u1eady m\u00e0 nh\u1eefng nh\u00e0 th\u01a1, nh\u00e0 v\u0103n s\u1ebd l\u1ea5y s\u1ed1 nguy\u00ean t\u1ed1 \u0111\u1ec3 th\u1ec3 hi\u1ec7n s\u1ef1 c\u00f4 \u0111\u01a1n c\u1ee7a ai \u0111\u00f3 trong t\u00ecnh y\u00eau.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">T\u00ednh ch\u1ea5t \u0111\u1eb7c bi\u1ec7t c\u1ee7a s\u1ed1 nguy\u00ean t\u1ed1 l\u00e0 g\u00ec?<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">S\u1ed1 nguy\u00ean t\u1ed1 c\u00f3 m\u1ed9t v\u00e0i \u0111\u1eb7c tr\u01b0ng nh\u01b0 sau gi\u00fap c\u00e1c b\u1ea1n c\u00f3 th\u1ec3 t\u00ednh to\u00e1n \u0111\u01a1n gi\u1ea3n h\u01a1n:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">S\u1ed1 2: S\u1ed1 ch\u1eb5n duy nh\u1ea5t trong d\u00e3y s\u1ed1 nguy\u00ean t\u1ed1 v\u00e0 l\u00e0 s\u1ed1 nguy\u00ean t\u1ed1 b\u00e9 nh\u1ea5t.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">S\u1ed1 11: S\u1ed1 b\u00e9 nh\u1ea5t g\u1ed3m 2 ch\u1eef s\u1ed1 trong d\u00e3y s\u1ed1 nguy\u00ean t\u1ed1.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">S\u1ed1 101: S\u1ed1 b\u00e9 nh\u1ea5t g\u1ed3m 3 ch\u1eef s\u1ed1 trong d\u00e3y s\u1ed1 nguy\u00ean t\u1ed1.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">S\u1ed1 97: S\u1ed1 l\u1edbn nh\u1ea5t g\u1ed3m 2 ch\u1eef s\u1ed1 trong d\u00e3y s\u1ed1 nguy\u00ean t\u1ed1.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">S\u1ed1 997: S\u1ed1 l\u1edbn nh\u1ea5t g\u1ed3m 3 ch\u1eef s\u1ed1 trong d\u00e3y s\u1ed1 nguy\u00ean t\u1ed1.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">S\u1ed1 l\u01b0\u1ee3ng c\u00e1c s\u1ed1 nguy\u00ean t\u1ed1 hi\u1ec7n nay l\u00e0 kh\u00f4ng gi\u1edbi h\u1ea1n hay t\u1ed5 h\u1ee3p s\u1ed1 nguy\u00ean t\u1ed1 c\u00f3 t\u00ednh v\u00f4 h\u1ea1n.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Khi \u0111em 2 s\u1ed1 nguy\u00ean t\u1ed1 nh\u00e2n c\u00f9ng nhau th\u00ec k\u1ebft qu\u1ea3 c\u1ee7a n\u00f3 kh\u00f4ng ph\u1ea3i l\u00e0 s\u1ed1 h\u00ecnh vu\u00f4ng.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">\u01af\u1edbc b\u00e9 nh\u1ea5t (#1) c\u1ee7a 1 s\u1ed1 ch\u00ednh l\u00e0 1 s\u1ed1 nguy\u00ean t\u1ed1t v\u00ec s\u1ed1 n\u00e0y kh\u00f4ng c\u00f3 kh\u1ea3 n\u0103ng chia cho s\u1ed1 n\u00e0o kh\u00e1c.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">\u01af\u1edbc nh\u1ecf nh\u1ea5t (s\u1ed1 d\u01b0\u01a1ng # 1) c\u1ee7a 1 t\u1ed5 h\u1ee3p s\u1ed1 t\u1ef1 nhi\u00ean b b\u1ea5t k\u1ef3 l\u00e0 1 s\u1ed1 nguy\u00ean t\u1ed1 kh\u00f4ng l\u1edbn h\u01a1n c\u0103n b\u1eadc 2 c\u1ee7a s\u1ed1 b.\u00a0<\/span><\/li>\n<\/ul>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/so-nguyen-to-la-gi-3.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/so-nguyen-to-la-gi-3-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/so-nguyen-to-la-gi-3-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img decoding=\"async\" class=\"size-full wp-image-299247 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/so-nguyen-to-la-gi-3.jpg\" alt=\"so-nguyen-to-la-gi-3\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/so-nguyen-to-la-gi-3.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/so-nguyen-to-la-gi-3-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/so-nguyen-to-la-gi-3-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<h2><span style=\"font-weight: 400;\">Th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 l\u00e0 g\u00ec?<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">\u0110\u00e2y l\u00e0 nh\u1eefng s\u1ed1 nguy\u00ean t\u1ed1 nh\u00e2n v\u1edbi nhau v\u00e0 t\u1ea1o ra t\u00edch. Ho\u1eb7c b\u1ea1n c\u00f3 th\u1ec3 hi\u1ec3u \u0111\u01a1n gi\u1ea3n th\u1eeba s\u1ed1 nguy\u00ean t\u1ed1 \u0111\u01b0\u1ee3c d\u00f9ng trong nh\u1eefng ph\u00e9p nh\u00e2n nh\u1eefng s\u1ed1 nguy\u00ean t\u1ed1 l\u1ea1i v\u1edbi nhau. Sau \u0111\u00e2y l\u00e0 v\u00ed d\u1ee5 minh h\u1ecda:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">2 x 3 = 6. Nh\u01b0 v\u1eady s\u1ed1 2 v\u00e0 s\u1ed1 3 l\u00e0 nh\u1eefng s\u1ed1 thu\u1ed9c d\u00e3y s\u1ed1 nguy\u00ean t\u1ed1.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">3 x 5 x 7 = 105. Nh\u01b0 v\u1eady s\u1ed1 3, s\u1ed1 5, s\u1ed1 7 l\u00e0 nh\u1eefng s\u1ed1 thu\u1ed9c d\u00e3y s\u1ed1 nguy\u00ean t\u1ed1.<\/span><\/p>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/so-nguyen-to-la-gi-4.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/so-nguyen-to-la-gi-4-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/so-nguyen-to-la-gi-4-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img decoding=\"async\" class=\"size-full wp-image-299248 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/so-nguyen-to-la-gi-4.jpg\" alt=\"so-nguyen-to-la-gi-4\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/so-nguyen-to-la-gi-4.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/so-nguyen-to-la-gi-4-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/so-nguyen-to-la-gi-4-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<h2><span style=\"font-weight: 400;\">B\u1ea3ng t\u1ed5ng h\u1ee3p c\u00e1c s\u1ed1 nguy\u00ean t\u1ed1 \u0111\u1ea7y \u0111\u1ee7<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Sau khi t\u00ecm hi\u1ec3u s\u1ed1 nguy\u00ean t\u1ed1 l\u00e0 g\u00ec th\u00ec m\u1ecdi ng\u01b0\u1eddi c\u00f3 th\u1ec3 t\u00ecm hi\u1ec3u b\u1ea3ng t\u1ed5ng h\u1ee3p \u0111\u1ea7y \u0111\u1ee7 c\u00e1c s\u1ed1 nguy\u00ean t\u1ed1 hi\u1ec7n nay:<\/span><\/p>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/so-nguyen-to-la-gi-1.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/so-nguyen-to-la-gi-1-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/so-nguyen-to-la-gi-1-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-299245 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/so-nguyen-to-la-gi-1.jpg\" alt=\"so-nguyen-to-la-gi-1\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/so-nguyen-to-la-gi-1.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/so-nguyen-to-la-gi-1-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/so-nguyen-to-la-gi-1-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<p><span style=\"font-weight: 400;\">Trong b\u1ea3ng tr\u00ean th\u00ec c\u00f3 hai s\u1ed1 0 v\u00e0 1 kh\u00f4ng \u0111\u01b0\u1ee3c coi nh\u01b0 s\u1ed1 nguy\u00ean t\u1ed1.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">M\u1ed9t s\u1ed1 \u0111\u1ecbnh ngh\u0129a li\u00ean quan v\u1edbi s\u1ed1 nguy\u00ean t\u1ed1<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">C\u00f3 m\u1ed9t s\u1ed1 kh\u00e1i ni\u1ec7m kh\u00e1c li\u00ean quan \u0111\u1ebfn lo\u1ea1i s\u1ed1 n\u00e0y nh\u01b0 s\u1ed1 nguy\u00ean t\u1ed1 nguy\u00ean nhau. S\u1ed1 n\u00e0y l\u00e0 s\u1ed1 trong d\u00e3y s\u1ed1 t\u1ef1 nhi\u00ean v\u00e0 \u01b0\u1edbc s\u1ed1 chung cao nh\u1ea5t = 1. Sau \u0111\u00e2y l\u00e0 nh\u1eefng v\u00ed d\u1ee5 v\u1ec1 s\u1ed1 nguy\u00ean t\u1ed1 c\u00f9ng nhau:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">S\u1ed1 2 v\u1edbi s\u1ed1 3<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">S\u1ed1 5 v\u00e0 s\u1ed1 7<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">S\u1ed1 13 v\u00e0 s\u1ed1 27<\/span><\/li>\n<\/ul>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/so-nguyen-to-la-gi-6.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/so-nguyen-to-la-gi-6-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/so-nguyen-to-la-gi-6-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-299250 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/so-nguyen-to-la-gi-6.jpg\" alt=\"so-nguyen-to-la-gi-6\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/so-nguyen-to-la-gi-6.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/so-nguyen-to-la-gi-6-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/so-nguyen-to-la-gi-6-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<p><span style=\"font-weight: 400;\">Ngo\u00e0i ra, ch\u00fang ta c\u00f3 th\u1ec3 t\u00ecm hi\u1ec3u th\u00eam m\u1ed9t kh\u00e1i ni\u1ec7m kh\u00e1c v\u1ec1 s\u1ed1 nguy\u00ean t\u1ed1 l\u00e0 s\u1ed1 si\u00eau nguy\u00ean t\u1ed1. S\u1ed1 n\u00e0y c\u00f3 \u0111\u1eb7c \u0111i\u1ec3m l\u00e0 khi b\u1ea1n b\u1ecf 1 ch\u1eef s\u1ed1 b\u00ean ph\u1ea3i\u00a0 n\u00f3 th\u00ec nh\u1eefng ch\u1eef s\u1ed1 c\u00f2n l\u1ea1i c\u00f3 th\u1ec3 t\u1ea1o ra 1 s\u1ed1 nguy\u00ean t\u1ed1 m\u1edbi. Ch\u1eb3ng h\u1ea1n nh\u01b0 2333 l\u00e0 s\u1ed1 g\u1ed3m c\u00f3 04 ch\u1eef s\u1ed1 v\u00e0 nh\u1eefng s\u1ed1 2, 23, 233 \u0111\u1ec1u l\u00e0 nh\u1eefng s\u1ed1 nguy\u00ean t\u1ed1. Ngo\u00e0i ra c\u00f2n nhi\u1ec1u s\u1ed1 si\u00eau nguy\u00ean t\u1ed1 m\u00e0 b\u1ea1n hay g\u1eb7p nh\u01b0 37337, 2339, 7333, 2393, 7393,&#8230;<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Ph\u01b0\u01a1ng ph\u00e1p t\u00ecm s\u1ed1 nguy\u00ean t\u1ed1 l\u00e0 g\u00ec?<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Hi\u1ec7n nay c\u00f3 kh\u00e1 nhi\u1ec1u c\u00e1ch gi\u00fap b\u1ea1n t\u00ecm s\u1ed1 nguy\u00ean t\u1ed1 nh\u01b0 sau:<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Th\u1eed nghi\u1ec7m c\u00e1c s\u1ed1 nguy\u00ean t\u1ed1<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">B\u1ea1n c\u00f3 th\u1ec3 l\u1ea5y s\u1ed1 nguy\u00ean t\u1ed1 \u0111\u00f3 \u0111\u1ec3 ki\u1ec3m tra, n\u1ebfu nh\u01b0 s\u1ed1 n\u00e0y b\u00e9 h\u01a1n 2 th\u00ec nh\u1eadn \u0111\u1ecbnh n\u00f3 kh\u00f4ng thu\u1ed9c d\u00e3y s\u1ed1 nguy\u00ean t\u1ed1. B\u1ea1n c\u0169ng c\u00f3 th\u1ec3 ki\u1ec3m tra b\u1eb1ng vi\u1ec7c \u0111\u1ebfm s\u1ed1 l\u01b0\u1ee3ng \u01b0\u1edbc c\u1ee7a m\u1ed9t s\u1ed1 t\u1ef1 nhi\u00ean trong kho\u1ea3ng t\u1eeb 2 t\u1edbi c\u0103n b\u1eadc 2 c\u1ee7a s\u1ed1 \u0111\u00f3. N\u1ebfu nh\u01b0 s\u1ed1 n\u00e0y kh\u00f4ng t\u1ed3n t\u1ea1i \u01b0\u1edbc trong kho\u1ea3ng t\u1eeb 2 t\u1edbi c\u0103n b\u1eadc 2 c\u1ee7a s\u1ed1 \u0111\u00f3, b\u1ea1n c\u00f3 th\u1ec3 nh\u1eadn \u0111\u1ecbnh n\u00f3 thu\u1ed9c d\u00e3y s\u1ed1 nguy\u00ean t\u1ed1. N\u1ebfu ng\u01b0\u1ee3c l\u1ea1i th\u00ec n\u00f3 kh\u00f4ng \u0111\u01b0\u1ee3c coi nh\u01b0 s\u1ed1 nguy\u00ean t\u1ed1.<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Ki\u1ec3m tra b\u1eb1ng c\u00e1ch chia th\u1eed<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">V\u1edbi ph\u01b0\u01a1ng ph\u00e1p n\u00e0y, m\u1ecdi ng\u01b0\u1eddi c\u1ea7n l\u1ea5y s\u1ed1 mu\u1ed1n ki\u1ec3m tra \u0111i chia cho s\u1ed1 kh\u00e1c nh\u01b0 l\u00fd thuy\u1ebft l\u00e0 c\u00f3 th\u1ec3 nh\u1eadn \u0111\u1ecbnh \u0111\u01b0\u1ee3c s\u1ed1 \u0111\u00f3 c\u00f3 ph\u1ea3i s\u1ed1 nguy\u00ean t\u1ed1 hay kh\u00f4ng. Tuy \u0111\u00e2y l\u00e0 ph\u01b0\u01a1ng ph\u00e1p t\u00ecm s\u1ed1 nguy\u00ean t\u1ed1 \u0111\u01a1n gi\u1ea3n nh\u01b0ng n\u00f3 l\u1ea1i m\u1ea5t th\u1eddi gian, c\u00f3 kh\u1ea3 n\u0103ng x\u1ea3y ra sai s\u1ed1 khi b\u1ea1n chia.<\/span><\/p>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/so-nguyen-to-la-gi-7.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/so-nguyen-to-la-gi-7-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/so-nguyen-to-la-gi-7-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-299251 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/so-nguyen-to-la-gi-7.jpg\" alt=\"so-nguyen-to-la-gi-7\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/so-nguyen-to-la-gi-7.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/so-nguyen-to-la-gi-7-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/so-nguyen-to-la-gi-7-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<h3><span style=\"font-weight: 400;\">L\u1eb7p m\u1ed7i ph\u1ea7n t\u1eed c\u00f9ng b\u01b0\u1edbc nh\u1ea3y m\u1ed9t<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">V\u1edbi ph\u01b0\u01a1ng ph\u00e1p n\u00e0y th\u00ec b\u1ea1n c\u00f3 th\u1ec3 l\u00e0m theo nh\u1eefng b\u01b0\u1edbc sau \u0111\u1ec3 ki\u1ec3m tra s\u1ed1 nguy\u00ean t\u1ed1:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">B\u01b0\u1edbc 1: Ch\u1ecdn m\u1ed9t s\u1ed1 t\u1ef1 nhi\u00ean (n) b\u1ea5t k\u1ef3.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">B\u01b0\u1edbc 2: B\u1ea1n xem s\u1ed1 \u0111\u00f3 c\u00f3 b\u00e9 h\u01a1n 2 kh\u00f4ng r\u1ed3i \u0111\u01b0a ra nh\u1eadn \u0111\u1ecbnh r\u1eb1ng kh\u00f4ng thu\u1ed9c d\u00e3y s\u1ed1 nguy\u00ean t\u1ed1.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">B\u01b0\u1edbc 3: B\u1ea1n c\u1ea7n ki\u1ec3m tra l\u1eb7p l\u1ea1i t\u1eeb s\u1ed1 2 \u0111\u1ebfn s\u1ed1 n &#8211; 1. N\u1ebfu \u1edf kho\u1ea3ng l\u1eb7p n\u00e0y m\u00e0 xu\u1ea5t hi\u1ec7n m\u1ed9t s\u1ed1 m\u00e0 s\u1ed1 n chia h\u1ebft cho n\u00f3 th\u00ec ch\u00fang ta c\u00f3 th\u1ec3 nh\u1eadn \u0111\u1ecbnh r\u1eb1ng s\u1ed1 n kh\u00f4ng thu\u1ed9c d\u00e3y s\u1ed1 nguy\u00ean t\u1ed1. N\u1ebfu nh\u01b0 nh\u1eadn \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 l\u00e0 ng\u01b0\u1ee3c l\u1ea1i th\u00ec s\u1ed1 n thu\u1ed9c d\u00e3y s\u1ed1 nguy\u00ean t\u1ed1.<\/span><\/li>\n<\/ul>\n<h3><span style=\"font-weight: 400;\">L\u1eb7p m\u1ed7i ph\u1ea7n t\u1eed c\u00f9ng b\u01b0\u1edbc nh\u1ea3y hai<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Theo kh\u00e1i ni\u1ec7m gi\u1ea3i th\u00edch v\u1ec1 s\u1ed1 nguy\u00ean t\u1ed1 l\u00e0 g\u00ec th\u00ec 2 l\u00e0 s\u1ed1 ch\u1eb5n duy nh\u1ea5t trong d\u00e3y s\u1ed1 nguy\u00ean t\u1ed1. V\u00ec v\u1eady m\u00e0 b\u1ea1n lo\u1ea1i s\u1ed1 2 ra ngo\u00e0i v\u00f2ng l\u1eb7p. L\u00fac \u0111\u00f3 trong kho\u1ea3ng v\u00f2ng l\u1eb7p th\u00ec m\u1ecdi ng\u01b0\u1eddi ch\u1ec9 c\u1ea7n xem x\u00e9t nh\u1eefng s\u1ed1 l\u1ebb c\u00f3 ph\u1ea3i s\u1ed1 nguy\u00ean t\u1ed1 hay kh\u00f4ng. \u0110\u00f3 ch\u00ednh l\u00e0 ph\u01b0\u01a1ng ph\u00e1p ki\u1ec3m tra s\u1ed1 nguy\u00ean t\u1ed1t r\u1ea5t chu\u1ea9n x\u00e1c.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">B\u00e0i t\u1eadp v\u1eadn d\u1ee5ng c\u1ee7a s\u1ed1 nguy\u00ean t\u1ed1 k\u00e8m \u0111\u00e1p \u00e1n<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Khi \u0111\u00e3 t\u00ecm hi\u1ec3u s\u1ed1 nguy\u00ean t\u1ed1 l\u00e0 g\u00ec v\u00e0 t\u00ednh ch\u1ea5t c\u1ee7a n\u00f3 th\u00ec m\u1ecdi ng\u01b0\u1eddi c\u00f3 th\u1ec3 t\u00ecm hi\u1ec3u m\u1ed9t v\u00e0i b\u00e0i t\u1eadp v\u1eadn d\u1ee5ng nh\u01b0 sau:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Hi\u1ec7n nay c\u00f3 kh\u00e1 nhi\u1ec1u lo\u1ea1i b\u00e0i t\u1eadp li\u00ean quan \u0111\u1ebfn s\u1ed1 nguy\u00ean t\u1ed1t t\u1eeb \u0111\u01a1n gi\u1ea3n \u0111\u1ebfn ph\u1ee9c t\u1ea1p. B\u00e0i t\u1eadp ch\u1ee7 y\u1ebfu ph\u00e2n lo\u1ea1i c\u0103n c\u1ee9 tr\u00ean t\u00ednh ch\u1ea5t \u0111\u1eb7c tr\u01b0ng c\u1ee7a s\u1ed1 n\u00e0y. V\u00ec v\u1eady \u0111\u1ec3 l\u00e0m t\u1ea5t c\u1ea3 nh\u1eefng b\u00e0i t\u1eadp li\u00ean quan \u0111\u1ebfn s\u1ed1 nguy\u00ean t\u1ed1 th\u00ec b\u1ea1n c\u1ea7n n\u1eafm m\u1ed9t s\u1ed1 d\u1ea1ng b\u00e0i t\u1eadp th\u01b0\u1eddng g\u1eb7p nh\u01b0 sau:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">B\u00e0i t\u1eadp v\u1ec1 b\u1ed9i v\u00e0 \u01b0\u1edbc c\u1ee7a c\u00e1c s\u1ed1 nguy\u00ean t\u1ed1.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">B\u00e0i t\u1eadp v\u1ec1 hi\u1ec7u, t\u1ed5ng c\u1ee7a c\u00e1c s\u1ed1 nguy\u00ean t\u1ed1.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">B\u00e0i t\u1eadp v\u1ec1 d\u1ea5u hi\u1ec7u nh\u1eadn bi\u1ebft s\u1ed1 nguy\u00ean t\u1ed1.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">B\u00e0i t\u1eadp v\u1ec1 ch\u1ee9ng minh s\u1ed1 nguy\u00ean t\u1ed1.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Sau \u0111\u00e2y l\u00e0 m\u1ed9t v\u00e0i b\u00e0i t\u1eadp c\u1ee5 th\u1ec3 v\u1ec1 s\u1ed1 nguy\u00ean t\u1ed1:<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">B\u00e0i t\u1eadp 1<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">H\u00e3y t\u00ecm ra s\u1ed1 c\u00f3 gi\u00e1 tr\u1ecb b\u00e9 nh\u1ea5t trong 3 s\u1ed1 nguy\u00ean t\u1ed1 c\u00f3 t\u1ed5ng l\u00e0 1322.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u00e1p \u00e1n:\u00a0<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">V\u00ec t\u1ed5ng c\u1ee7a 3 s\u1ed1 tr\u00ean l\u00e0 s\u1ed1 ch\u1eb5n n\u00ean 3 s\u1ed1 n\u00e0y c\u00f3 th\u1ec3 l\u00e0 3 s\u1ed1 l\u1ebb ho\u1eb7c 3 s\u1ed1 ch\u1eb5n v\u1edbi 1 s\u1ed1 l\u1ebb.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">1 trong 3 s\u1ed1 tr\u00ean b\u1eaft bu\u1ed9c l\u00e0 m\u1ed9t s\u1ed1 ch\u1eb5n.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">V\u1eady k\u1ebft lu\u1eadn s\u1ed1 b\u00e9 nh\u1ea5t trong 3 s\u1ed1 nguy\u00ean t\u1ed1 \u1edf tr\u00ean l\u00e0 s\u1ed1 2.<\/span><\/li>\n<\/ul>\n<h3><span style=\"font-weight: 400;\">B\u00e0i t\u1eadp 2<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">T\u00ecm t\u1ea5t c\u1ea3 nh\u1eefng s\u1ed1 n l\u00e0 s\u1ed1 t\u1ef1 nhi\u00ean \u0111\u1ec3 t\u1eebng s\u1ed1 n\u00e0y \u0111\u01b0\u1ee3c coi nh\u01b0 s\u1ed1 nguy\u00ean t\u1ed1:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">n\u20135<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">n\u20134<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">n\u20133<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">n+1<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">n+5.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">\u0110\u00e1p \u00e1n:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">S\u1ed1 nh\u1ecf nh\u1ea5t trong d\u00e3y s\u1ed1 nguy\u00ean t\u1ed1 l\u00e0 s\u1ed1 1. V\u00ec v\u1eady (n &#8211; 5) l\u1edbn h\u01a1n 1 n\u00ean n s\u1ebd l\u1edbn h\u01a1n 6. Khi x\u00e9t s\u1ed1 n = 6 th\u00ec ta \u0111\u01b0\u1ee3c:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">n\u20135=1.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">n\u20134=2.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">n\u20133=3.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">n\u20131=5.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">n+1=7.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">n+5=11.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Nh\u01b0 v\u1eady ta c\u00f3 c\u00e1c s\u1ed1 1 &#8211; 2 &#8211; 3 &#8211; 5 &#8211; 7 &#8211; 11 l\u00e0 nh\u1eefng s\u1ed1 thu\u1ed9c d\u00e3y s\u1ed1 nguy\u00ean t\u1ed1. V\u00ec v\u1eady m\u00e0 s\u1ed1 t\u1ef1 nhi\u00ean n = 6 c\u00f3 th\u1ec3 \u0111\u00e1p \u1ee9ng nh\u1eefng \u0111i\u1ec1u ki\u1ec7n c\u1ee7a b\u00e0i t\u1eadp.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Ch\u00fang ta c\u00f3 th\u1ec3 k\u1ebft lu\u1eadn \u0111\u01b0\u1ee3c s\u1ed1 t\u1ef1 nhi\u00ean n \u0111\u00f3 l\u00e0 s\u1ed1 6.<\/span><\/p>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/so-nguyen-to-la-gi-10.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/so-nguyen-to-la-gi-10-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/so-nguyen-to-la-gi-10-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-299252 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/so-nguyen-to-la-gi-10.jpg\" alt=\"so-nguyen-to-la-gi-10\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/so-nguyen-to-la-gi-10.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/so-nguyen-to-la-gi-10-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/so-nguyen-to-la-gi-10-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<h3><span style=\"font-weight: 400;\">B\u00e0i t\u1eadp 3<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">H\u00e3y t\u00ecm s\u1ed1 k \u0111\u1ec3 \u0111\u00e1p \u1ee9ng \u0111i\u1ec1u ki\u1ec7n 13k, 17k \u0111\u1ec1u thu\u1ed9c d\u00e3y s\u1ed1 nguy\u00ean t\u1ed1.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u00e1p \u00e1n:\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Theo l\u00fd thuy\u1ebft th\u00ec s\u1ed1 \u0111\u01b0\u1ee3c coi l\u00e0 s\u1ed1 nguy\u00ean t\u1ed1t khi n\u00f3 c\u00f3 kh\u1ea3 n\u0103ng chia h\u1ebft cho b\u1ea3n th\u00e2n n\u00f3 v\u00e0 chia h\u1ebft cho s\u1ed1 1. Nh\u01b0 v\u1eady ta c\u00f3:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">S\u1ed1 13 v\u00e0 s\u1ed1 17 \u0111\u1ec1u thu\u1ed9c b\u1ea3ng s\u1ed1 nguy\u00ean t\u1ed1.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u1ec3 13k thu\u1ed9c b\u1ea3ng s\u1ed1 nguy\u00ean t\u1ed1, k ph\u1ea3i b\u1eb1ng 1.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u1ec3 cho 17k thu\u1ed9c b\u1ea3ng s\u1ed1 nguy\u00ean t\u1ed1 th\u00ec k ph\u1ea3i b\u1eb1ng 1.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">V\u1eady k\u1ebft lu\u1eadn s\u1ed1 13k v\u00e0 s\u1ed1 17k s\u1ebd tr\u1edf th\u00e0nh s\u1ed1 nguy\u00ean t\u1ed1 khi k b\u1eb1ng 1.<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">B\u00e0i t\u1eadp 4 <\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Ta c\u00f3 2 s\u1ed1 l\u00e0 13 v\u00e0 11. V\u1eady 2 s\u1ed1 n\u00e0y c\u00f3 th\u1ec3 tr\u1edf th\u00e0nh s\u1ed1 nguy\u00ean t\u1ed1 c\u00f9ng nhau \u0111\u01b0\u1ee3c kh\u00f4ng?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u00e1p \u00e1n:\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">13 = 1 x 13\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">11 = 1 x 11<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Suy ra \u01b0\u1edbc chung cao nh\u1ea5t c\u1ee7a s\u1ed1 11 v\u00e0 s\u1ed1 13 ch\u00ednh l\u00e0 s\u1ed1 1 v\u00e0 \u0111\u00e2y c\u0169ng l\u00e0 2 s\u1ed1 nguy\u00ean t\u1ed1 c\u00f9ng nhau.<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">B\u00e0i t\u1eadp 5<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Ta c\u00f3 2 s\u1ed1 8 v\u00e0 s\u1ed1 7. V\u1eady 2 s\u1ed1 n\u00e0y c\u00f3 th\u1ec3 tr\u1edf th\u00e0nh s\u1ed1 nguy\u00ean t\u1ed1 c\u00f9ng nhau?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u00e1p \u00e1n:\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">7 = 1 x 7<\/span><\/p>\n<p><span style=\"font-weight: 400;\">8 = 1 x 2 x 2 x 2<\/span><\/p>\n<p><span style=\"font-weight: 400;\">V\u1eady ta th\u1ea5y \u0111\u01b0\u1ee3c \u01b0\u1edbc chung cao nh\u1ea5t gi\u1eefa 2 s\u1ed1 8\u00a0 v\u00e0 s\u1ed1 7 ch\u00ednh l\u00e0 s\u1ed1 1. Ch\u00fang ta nh\u1eadn \u0111\u1ecbnh r\u1eb1ng \u0111\u00e2y l\u00e0 2 s\u1ed1 nguy\u00ean t\u1ed1 c\u00f9ng nhau.\u00a0<\/span><\/p>\n<p><picture><source srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/so-nguyen-to-la-gi-11.jpg.webp 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/so-nguyen-to-la-gi-11-300x169.jpg.webp 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/so-nguyen-to-la-gi-11-768x432.jpg.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" type=\"image\/webp\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-299253 aligncenter webpexpress-processed\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/so-nguyen-to-la-gi-11.jpg\" alt=\"so-nguyen-to-la-gi-11\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/so-nguyen-to-la-gi-11.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/so-nguyen-to-la-gi-11-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/so-nguyen-to-la-gi-11-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\"><\/picture><\/p>\n<h3><span style=\"font-weight: 400;\">B\u00e0i t\u1eadp 6<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Ta c\u00f3 2p + 2 v\u00e0 p \u0111\u1ec1u l\u00e0 nh\u1eefng s\u1ed1 thu\u1ed9c b\u1ea3ng s\u1ed1 nguy\u00ean t\u1ed1 ( \u0111i\u1ec1u ki\u1ec7n p l\u1edbn h\u01a1n 5). V\u1eady th\u00ec s\u1ed1 4p + 1 l\u00e0 h\u1ee3p s\u1ed1 hay s\u1ed1 nguy\u00ean t\u1ed1?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u00e1p \u00e1n:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">V\u00ec p l\u00e0 1 s\u1ed1 nguy\u00ean t\u1ed1 cao h\u01a1n s\u1ed1 3 \u2192 p kh\u00f4ng c\u00f3 kh\u1ea3 n\u0103ng chia h\u1ebft cho s\u1ed1 3 \u2192 4p kh\u00f4ng c\u00f3 kh\u1ea3 n\u0103ng chi h\u1ebft cho s\u1ed1 3.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">V\u00ec 2p + 1 \u0111\u01b0\u1ee3c coi l\u00e0 s\u1ed1 nguy\u00ean t\u1ed1 cao h\u01a1n s\u1ed1 3 \u2192 2p + 1 c\u0169ng kh\u00f4ng th\u1ec3 chia h\u1ebft cho s\u1ed1 3 \u2192 2 (2p+1) c\u0169ng kh\u00f4ng th\u1ec3 chia h\u1ebft cho s\u1ed1 3 ho\u1eb7c s\u1ed1 4p+2 c\u0169ng kh\u00f4ng th\u1ec3 chia h\u1ebft cho s\u1ed1 3. B\u00ean c\u1ea1nh \u0111\u00f3, trong ba s\u1ed1 k\u1ec1 nhau l\u00e0 4p; 4p+1; 4p+2 th\u00ec ch\u1ec9 c\u00f3 1 s\u1ed1 c\u00f3 th\u1ec3 chia h\u1ebft cho s\u1ed1 3. V\u00ec v\u1eady m\u00e0 s\u1ed1 4p+1 c\u00f3 th\u1ec3 chia h\u1ebft cho s\u1ed1 3. M\u00e0 s\u1ed1 4p+1 c\u00f2n l\u1edbn h\u01a1n 3 \u2192 S\u1ed1 4p+1 \u0111\u01b0\u1ee3c coi l\u00e0 h\u1ee3p s\u1ed1.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">B\u00e0i vi\u1ebft tr\u00ean \u0111\u00e3 gi\u1edbi thi\u1ec7u kh\u00e1 nhi\u1ec1u v\u1ec1 s\u1ed1 nguy\u00ean t\u1ed1 l\u00e0 g\u00ec cho c\u00e1c b\u1ea1n c\u00f9ng t\u00ecm hi\u1ec3u. Hy v\u1ecdng c\u00e1c b\u1ea1n c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng c\u00e1c ph\u01b0\u01a1ng ph\u00e1p t\u00ecm s\u1ed1 nguy\u00ean t\u1ed1 \u1edf tr\u00ean \u0111\u1ec3 l\u00e0m c\u00e1c b\u00e0i t\u1eadp li\u00ean quan m\u1ed9t c\u00e1ch nhanh ch\u00f3ng h\u01a1n. \u0110\u00e2y l\u00e0 ki\u1ebfn th\u1ee9c n\u1ec1n t\u1ea3ng m\u00e0 b\u1ea5t c\u1ee9 h\u1ecdc sinh n\u00e0o c\u0169ng ph\u1ea3i n\u1eafm r\u00f5 \u0111\u1ec3 h\u1ecdc to\u00e1n t\u1ed1t h\u01a1n.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Tham kh\u1ea3o b\u00e0i vi\u1ebft li\u00ean quan:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/so-thuc-la-gi\/\"><span style=\"font-weight: 400;\">S\u1ed1 th\u1ef1c l\u00e0 g\u00ec? M\u1ed9t s\u1ed1 d\u1ea1ng to\u00e1n h\u1ecdc ph\u1ed5 bi\u1ebfn v\u1ec1 s\u1ed1 th\u1ef1c<\/span><\/a><\/li>\n<li style=\"font-weight: 400;\"><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/duong-trung-tuyen-la-gi\/\"><span style=\"font-weight: 400;\">\u0110\u01b0\u1eddng trung tuy\u1ebfn l\u00e0 g\u00ec? T\u00ednh ch\u1ea5t, c\u00f4ng th\u1ee9c v\u00e0 b\u00e0i t\u1eadp t\u00ednh \u0111\u01b0\u1eddng trung tuy\u1ebfn<\/span><\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>S\u1ed1 nguy\u00ean t\u1ed1 l\u00e0 g\u00ec? \u0110\u00e2y l\u00e0 m\u1ed9t \u0111\u1ecbnh ngh\u0129a m\u00e0 h\u1ea7u h\u1ebft nh\u1eefng h\u1ecdc sinh hi\u1ec7n nay \u0111\u1ec1u ph\u1ea3i n\u1eafm \u0111\u1ec3 gi\u1ea3i b\u00e0i t\u1eadp to\u00e1n ch\u00ednh x\u00e1c. \u0110\u00e2y c\u0169ng l\u00e0 ki\u1ebfn th\u1ee9c l\u00e0m n\u1ec1n t\u1ea3ng \u0111\u1ec3 c\u00e1c b\u1ea1n c\u00f3 th\u1ec3 l\u00e0m t\u1ed1t nh\u1eefng b\u00e0i ki\u1ec3m tra, b\u00e0i thi quan tr\u1ecdng. V\u1eady th\u00ec b\u00e0i vi\u1ebft [&hellip;]<\/p>\n","protected":false},"author":102,"featured_media":299244,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3910,30453],"tags":[],"class_list":["post-299231","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-kham-pha","category-kien-thuc"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.2 (Yoast SEO v24.2) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>S\u1ed1 nguy\u00ean t\u1ed1 l\u00e0 g\u00ec? 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