{"id":624298,"date":"2026-11-15T08:08:45","date_gmt":"2026-11-15T01:08:45","guid":{"rendered":"https:\/\/hoanghamobile.com\/tin-tuc\/?p=624298"},"modified":"2026-11-15T08:08:45","modified_gmt":"2026-11-15T01:08:45","slug":"giai-bai-toan-bang-cach-lap-phuong-trinh","status":"publish","type":"post","link":"https:\/\/hoanghamobile.com\/tin-tuc\/giai-bai-toan-bang-cach-lap-phuong-trinh\/","title":{"rendered":"C\u00e1c b\u01b0\u1edbc gi\u1ea3i b\u00e0i to\u00e1n b\u1eb1ng c\u00e1ch l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh v\u00e0 v\u00ed d\u1ee5"},"content":{"rendered":"<p>Mu\u1ed1n gi\u1ea3i b\u00e0i to\u00e1n b\u1eb1ng c\u00e1ch l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh, b\u1ea1n ch\u1ec9 c\u1ea7n nh\u1edb 3 b\u01b0\u1edbc: <strong>(1) l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh<\/strong> \u2013 ch\u1ecdn \u1ea9n, \u0111\u1eb7t \u0111i\u1ec1u ki\u1ec7n, bi\u1ec3u di\u1ec5n c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng ch\u01b0a bi\u1ebft theo \u1ea9n r\u1ed3i l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh; <strong>(2) gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh<\/strong>; <strong>(3) tr\u1ea3 l\u1eddi<\/strong> \u2013 \u0111\u1ed1i chi\u1ebfu nghi\u1ec7m v\u1edbi \u0111i\u1ec1u ki\u1ec7n v\u00e0 k\u1ebft lu\u1eadn. \u0110\u00e2y l\u00e0 d\u1ea1ng b\u00e0i xu\u1ea5t hi\u1ec7n th\u01b0\u1eddng xuy\u00ean trong To\u00e1n 8, To\u00e1n 9 v\u00e0 \u0111\u1ec1 thi v\u00e0o l\u1edbp 10. Ph\u1ea7n d\u01b0\u1edbi \u0111\u00e2y tr\u00ecnh b\u00e0y c\u00e1ch l\u00e0m t\u1eebng b\u01b0\u1edbc, b\u1ea3ng c\u00f4ng th\u1ee9c theo d\u1ea1ng to\u00e1n v\u00e0 10 v\u00ed d\u1ee5 c\u00f3 l\u1eddi gi\u1ea3i chi ti\u1ebft, t\u1eeb chuy\u1ec3n \u0111\u1ed9ng, n\u0103ng su\u1ea5t, s\u1ed1 h\u1ecdc \u0111\u1ebfn h\u00ecnh h\u1ecdc, \u0111\u1ec3 b\u1ea1n luy\u1ec7n t\u1eadp.<\/p>\n<h2>3 b\u01b0\u1edbc gi\u1ea3i b\u00e0i to\u00e1n b\u1eb1ng c\u00e1ch l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh<\/h2>\n<p>M\u1ecdi b\u00e0i to\u00e1n d\u1ea1ng n\u00e0y \u0111\u1ec1u \u0111i qua c\u00f9ng m\u1ed9t khung 3 b\u01b0\u1edbc, kh\u00e1c nhau ch\u1ee7 y\u1ebfu \u1edf c\u00e1ch bi\u1ec3u di\u1ec5n \u0111\u1ea1i l\u01b0\u1ee3ng.<\/p>\n<table>\n<thead>\n<tr>\n<th>B\u01b0\u1edbc<\/th>\n<th>Vi\u1ec7c c\u1ea7n l\u00e0m<\/th>\n<th>L\u01b0u \u00fd<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>B\u01b0\u1edbc 1: L\u1eadp ph\u01b0\u01a1ng tr\u00ecnh<\/td>\n<td>Ch\u1ecdn \u1ea9n, \u0111\u1eb7t \u0111\u01a1n v\u1ecb v\u00e0 \u0111i\u1ec1u ki\u1ec7n; bi\u1ec3u di\u1ec5n c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng ch\u01b0a bi\u1ebft theo \u1ea9n; l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh<\/td>\n<td>Th\u01b0\u1eddng ch\u1ecdn \u0111\u1ea1i l\u01b0\u1ee3ng \u0111\u1ec1 h\u1ecfi l\u00e0m \u1ea9n<\/td>\n<\/tr>\n<tr>\n<td>B\u01b0\u1edbc 2: Gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh<\/td>\n<td>Gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh v\u1eeba l\u1eadp<\/td>\n<td>Tr\u00ecnh b\u00e0y r\u00f5 c\u00e1c ph\u00e9p bi\u1ebfn \u0111\u1ed5i<\/td>\n<\/tr>\n<tr>\n<td>B\u01b0\u1edbc 3: Tr\u1ea3 l\u1eddi<\/td>\n<td>\u0110\u1ed1i chi\u1ebfu nghi\u1ec7m v\u1edbi \u0111i\u1ec1u ki\u1ec7n, lo\u1ea1i nghi\u1ec7m kh\u00f4ng ph\u00f9 h\u1ee3p, k\u1ebft lu\u1eadn<\/td>\n<td>Ghi \u0111\u01a1n v\u1ecb trong c\u00e2u tr\u1ea3 l\u1eddi<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>C\u00e1ch ch\u1ecdn \u1ea9n v\u00e0 \u0111\u1eb7t \u0111i\u1ec1u ki\u1ec7n<\/h2>\n<p>Ch\u1ecdn \u1ea9n \u0111\u00fang v\u00e0 \u0111\u1eb7t \u0111i\u1ec1u ki\u1ec7n ch\u1eb7t ch\u1ebd quy\u1ebft \u0111\u1ecbnh ph\u1ea7n l\u1edbn vi\u1ec7c b\u00e0i l\u00e0m c\u00f3 \u0111\u00fang hay kh\u00f4ng.<\/p>\n<ul>\n<li>\u0110\u1ecdc k\u1ef9 \u0111\u1ec1, x\u00e1c \u0111\u1ecbnh \u0111\u1ea1i l\u01b0\u1ee3ng \u0111\u00e3 bi\u1ebft v\u00e0 ch\u01b0a bi\u1ebft.<\/li>\n<li>Th\u01b0\u1eddng ch\u1ecdn ch\u00ednh \u0111\u1ea1i l\u01b0\u1ee3ng \u0111\u1ec1 b\u00e0i h\u1ecfi l\u00e0m \u1ea9n x.<\/li>\n<li>S\u1ed1 ng\u01b0\u1eddi, s\u1ed1 con v\u1eadt, s\u1ed1 s\u1ea3n ph\u1ea9m: x nguy\u00ean d\u01b0\u01a1ng.<\/li>\n<li>V\u1eadn t\u1ed1c, qu\u00e3ng \u0111\u01b0\u1eddng, th\u1eddi gian, \u0111\u1ed9 d\u00e0i: x &gt; 0.<\/li>\n<li>Ch\u1eef s\u1ed1: t\u1eeb 0 \u0111\u1ebfn 9, ch\u1eef s\u1ed1 h\u00e0ng ch\u1ee5c kh\u00e1c 0.<\/li>\n<li>L\u1eadp b\u1ea3ng t\u00f3m t\u1eaft c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng gi\u00fap d\u1ec5 l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh h\u01a1n.<\/li>\n<\/ul>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter size-full wp-image-624300\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/cac-buoc-giai-bai-toan-bang-cach-lap-phuong-trinh-1.jpg\" alt=\"cac-buoc-giai-bai-toan-bang-cach-lap-phuong-trinh-1\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/cac-buoc-giai-bai-toan-bang-cach-lap-phuong-trinh-1.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/cac-buoc-giai-bai-toan-bang-cach-lap-phuong-trinh-1-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/cac-buoc-giai-bai-toan-bang-cach-lap-phuong-trinh-1-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>C\u00f4ng th\u1ee9c th\u01b0\u1eddng d\u00f9ng theo t\u1eebng d\u1ea1ng to\u00e1n<\/h2>\n<p>M\u1ed7i d\u1ea1ng to\u00e1n d\u1ef1a tr\u00ean m\u1ed9t m\u1ed1i quan h\u1ec7 c\u1ed1 \u0111\u1ecbnh gi\u1eefa c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng, n\u1eafm ch\u1eafc m\u1ed1i quan h\u1ec7 n\u00e0y l\u00e0 l\u1eadp \u0111\u01b0\u1ee3c ph\u01b0\u01a1ng tr\u00ecnh.<\/p>\n<table>\n<thead>\n<tr>\n<th>D\u1ea1ng to\u00e1n<\/th>\n<th>M\u1ed1i quan h\u1ec7 c\u1ea7n nh\u1edb<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Chuy\u1ec3n \u0111\u1ed9ng<\/td>\n<td>Qu\u00e3ng \u0111\u01b0\u1eddng = v\u1eadn t\u1ed1c \u00d7 th\u1eddi gian (s = v.t)<\/td>\n<\/tr>\n<tr>\n<td>Chuy\u1ec3n \u0111\u1ed9ng tr\u00ean d\u00f2ng n\u01b0\u1edbc<\/td>\n<td>v xu\u00f4i = v ri\u00eang + v n\u01b0\u1edbc; v ng\u01b0\u1ee3c = v ri\u00eang \u2212 v n\u01b0\u1edbc<\/td>\n<\/tr>\n<tr>\n<td>N\u0103ng su\u1ea5t<\/td>\n<td>Kh\u1ed1i l\u01b0\u1ee3ng c\u00f4ng vi\u1ec7c = n\u0103ng su\u1ea5t \u00d7 th\u1eddi gian<\/td>\n<\/tr>\n<tr>\n<td>L\u00e0m chung, l\u00e0m ri\u00eang<\/td>\n<td>L\u00e0m xong trong x gi\u1edd th\u00ec 1 gi\u1edd l\u00e0m \u0111\u01b0\u1ee3c 1\/x c\u00f4ng vi\u1ec7c<\/td>\n<\/tr>\n<tr>\n<td>S\u1ed1 c\u00f3 hai ch\u1eef s\u1ed1<\/td>\n<td>S\u1ed1 ab = 10a + b (a t\u1eeb 1 \u0111\u1ebfn 9, b t\u1eeb 0 \u0111\u1ebfn 9)<\/td>\n<\/tr>\n<tr>\n<td>H\u00ecnh ch\u1eef nh\u1eadt<\/td>\n<td>Chu vi = 2(d\u00e0i + r\u1ed9ng); di\u1ec7n t\u00edch = d\u00e0i \u00d7 r\u1ed9ng<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>B\u1ea1n c\u00f3 th\u1ec3 \u00f4n l\u1ea1i c\u00e1ch d\u00f9ng s = v.t trong b\u00e0i <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/cong-thuc-tinh-quang-duong\/\">c\u00f4ng th\u1ee9c t\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng<\/a> tr\u01b0\u1edbc khi l\u00e0m c\u00e1c v\u00ed d\u1ee5 chuy\u1ec3n \u0111\u1ed9ng.<\/p>\n<h2>V\u00ed d\u1ee5 d\u1ea1ng to\u00e1n chuy\u1ec3n \u0111\u1ed9ng<\/h2>\n<p>V\u1edbi b\u00e0i chuy\u1ec3n \u0111\u1ed9ng, h\u00e3y l\u1eadp b\u1ea3ng g\u1ed3m ba c\u1ed9t v\u1eadn t\u1ed1c, th\u1eddi gian, qu\u00e3ng \u0111\u01b0\u1eddng cho t\u1eebng giai \u0111o\u1ea1n r\u1ed3i t\u00ecm \u0111\u1ea1i l\u01b0\u1ee3ng b\u1eb1ng nhau.<\/p>\n<h3>V\u00ed d\u1ee5 1: \u0110i v\u00e0 v\u1ec1 v\u1edbi v\u1eadn t\u1ed1c kh\u00e1c nhau<\/h3>\n<p><strong>\u0110\u1ec1 b\u00e0i:<\/strong> M\u1ed9t xe m\u00e1y \u0111i t\u1eeb A \u0111\u1ebfn B v\u1edbi v\u1eadn t\u1ed1c 40 km\/h, l\u00fac v\u1ec1 \u0111i v\u1edbi v\u1eadn t\u1ed1c 30 km\/h. T\u1ed5ng th\u1eddi gian \u0111i v\u00e0 v\u1ec1 l\u00e0 7 gi\u1edd. T\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng AB.<\/p>\n<ul>\n<li><strong>B\u01b0\u1edbc 1:<\/strong> G\u1ecdi qu\u00e3ng \u0111\u01b0\u1eddng AB l\u00e0 x (km), x &gt; 0. Th\u1eddi gian \u0111i l\u00e0 x\/40 gi\u1edd, th\u1eddi gian v\u1ec1 l\u00e0 x\/30 gi\u1edd. Ph\u01b0\u01a1ng tr\u00ecnh: x\/40 + x\/30 = 7.<\/li>\n<li><strong>B\u01b0\u1edbc 2:<\/strong> Quy \u0111\u1ed3ng m\u1eabu 120: 3x + 4x = 840 \u21d4 7x = 840 \u21d4 x = 120.<\/li>\n<li><strong>B\u01b0\u1edbc 3:<\/strong> x = 120 th\u1ecfa m\u00e3n. V\u1eady qu\u00e3ng \u0111\u01b0\u1eddng AB d\u00e0i 120 km.<\/li>\n<\/ul>\n<h3>V\u00ed d\u1ee5 2: Hai xe \u0111i ng\u01b0\u1ee3c chi\u1ec1u<\/h3>\n<p><strong>\u0110\u1ec1 b\u00e0i:<\/strong> Hai xe kh\u1edfi h\u00e0nh c\u00f9ng l\u00fac t\u1eeb A v\u00e0 B c\u00e1ch nhau 180 km, \u0111i ng\u01b0\u1ee3c chi\u1ec1u nhau v\u00e0 g\u1eb7p nhau sau 2 gi\u1edd. Bi\u1ebft v\u1eadn t\u1ed1c xe \u0111i t\u1eeb A l\u1edbn h\u01a1n xe \u0111i t\u1eeb B l\u00e0 10 km\/h. T\u00ednh v\u1eadn t\u1ed1c m\u1ed7i xe.<\/p>\n<ul>\n<li><strong>B\u01b0\u1edbc 1:<\/strong> G\u1ecdi v\u1eadn t\u1ed1c xe \u0111i t\u1eeb A l\u00e0 x (km\/h), x &gt; 10. V\u1eadn t\u1ed1c xe \u0111i t\u1eeb B l\u00e0 x \u2212 10. Sau 2 gi\u1edd, hai xe \u0111i \u0111\u01b0\u1ee3c t\u1ed5ng c\u1ed9ng 180 km: 2x + 2(x \u2212 10) = 180.<\/li>\n<li><strong>B\u01b0\u1edbc 2:<\/strong> 4x \u2212 20 = 180 \u21d4 4x = 200 \u21d4 x = 50.<\/li>\n<li><strong>B\u01b0\u1edbc 3:<\/strong> x = 50 th\u1ecfa m\u00e3n. Xe t\u1eeb A \u0111i 50 km\/h, xe t\u1eeb B \u0111i 40 km\/h. Ki\u1ec3m tra: 2 \u00d7 50 + 2 \u00d7 40 = 180, \u0111\u00fang.<\/li>\n<\/ul>\n<h3>V\u00ed d\u1ee5 3: Ca n\u00f4 xu\u00f4i d\u00f2ng, ng\u01b0\u1ee3c d\u00f2ng<\/h3>\n<p><strong>\u0110\u1ec1 b\u00e0i:<\/strong> M\u1ed9t ca n\u00f4 xu\u00f4i d\u00f2ng t\u1eeb A \u0111\u1ebfn B h\u1ebft 4 gi\u1edd v\u00e0 ng\u01b0\u1ee3c d\u00f2ng t\u1eeb B v\u1ec1 A h\u1ebft 5 gi\u1edd. V\u1eadn t\u1ed1c d\u00f2ng n\u01b0\u1edbc l\u00e0 2 km\/h. T\u00ednh v\u1eadn t\u1ed1c ri\u00eang c\u1ee7a ca n\u00f4 v\u00e0 qu\u00e3ng \u0111\u01b0\u1eddng AB.<\/p>\n<ul>\n<li><strong>B\u01b0\u1edbc 1:<\/strong> G\u1ecdi v\u1eadn t\u1ed1c ri\u00eang c\u1ee7a ca n\u00f4 l\u00e0 x (km\/h), x &gt; 2. V\u1eadn t\u1ed1c xu\u00f4i d\u00f2ng x + 2, ng\u01b0\u1ee3c d\u00f2ng x \u2212 2. Qu\u00e3ng \u0111\u01b0\u1eddng hai chi\u1ec1u b\u1eb1ng nhau: 4(x + 2) = 5(x \u2212 2).<\/li>\n<li><strong>B\u01b0\u1edbc 2:<\/strong> 4x + 8 = 5x \u2212 10 \u21d4 x = 18.<\/li>\n<li><strong>B\u01b0\u1edbc 3:<\/strong> x = 18 th\u1ecfa m\u00e3n. V\u1eadn t\u1ed1c ri\u00eang 18 km\/h, qu\u00e3ng \u0111\u01b0\u1eddng AB = 4 \u00d7 20 = 80 km (ng\u01b0\u1ee3c d\u00f2ng: 5 \u00d7 16 = 80 km, kh\u1edbp).<\/li>\n<\/ul>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-624299\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/cac-buoc-giai-bai-toan-bang-cach-lap-phuong-trinh-3.jpg\" alt=\"cac-buoc-giai-bai-toan-bang-cach-lap-phuong-trinh-3\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/cac-buoc-giai-bai-toan-bang-cach-lap-phuong-trinh-3.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/cac-buoc-giai-bai-toan-bang-cach-lap-phuong-trinh-3-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/cac-buoc-giai-bai-toan-bang-cach-lap-phuong-trinh-3-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>V\u00ed d\u1ee5 d\u1ea1ng to\u00e1n n\u0103ng su\u1ea5t, c\u00f4ng vi\u1ec7c<\/h2>\n<p>B\u00e0i n\u0103ng su\u1ea5t gi\u1ed1ng b\u00e0i chuy\u1ec3n \u0111\u1ed9ng: thay qu\u00e3ng \u0111\u01b0\u1eddng b\u1eb1ng kh\u1ed1i l\u01b0\u1ee3ng c\u00f4ng vi\u1ec7c v\u00e0 v\u1eadn t\u1ed1c b\u1eb1ng n\u0103ng su\u1ea5t.<\/p>\n<h3>V\u00ed d\u1ee5 4: Ho\u00e0n th\u00e0nh s\u1edbm h\u01a1n d\u1ef1 \u0111\u1ecbnh<\/h3>\n<p><strong>\u0110\u1ec1 b\u00e0i:<\/strong> M\u1ed9t t\u1ed5 s\u1ea3n xu\u1ea5t d\u1ef1 \u0111\u1ecbnh m\u1ed7i ng\u00e0y l\u00e0m 40 s\u1ea3n ph\u1ea9m. Th\u1ef1c t\u1ebf m\u1ed7i ng\u00e0y l\u00e0m \u0111\u01b0\u1ee3c 50 s\u1ea3n ph\u1ea9m n\u00ean ho\u00e0n th\u00e0nh k\u1ebf ho\u1ea1ch s\u1edbm h\u01a1n 3 ng\u00e0y. H\u1ecfi theo k\u1ebf ho\u1ea1ch t\u1ed5 ph\u1ea3i l\u00e0m bao nhi\u00eau s\u1ea3n ph\u1ea9m?<\/p>\n<ul>\n<li><strong>B\u01b0\u1edbc 1:<\/strong> G\u1ecdi s\u1ed1 s\u1ea3n ph\u1ea9m theo k\u1ebf ho\u1ea1ch l\u00e0 x (s\u1ea3n ph\u1ea9m), x nguy\u00ean d\u01b0\u01a1ng. Th\u1eddi gian d\u1ef1 \u0111\u1ecbnh x\/40 ng\u00e0y, th\u1eddi gian th\u1ef1c t\u1ebf x\/50 ng\u00e0y. Ph\u01b0\u01a1ng tr\u00ecnh: x\/40 \u2212 x\/50 = 3.<\/li>\n<li><strong>B\u01b0\u1edbc 2:<\/strong> Quy \u0111\u1ed3ng m\u1eabu 200: 5x \u2212 4x = 600 \u21d4 x = 600.<\/li>\n<li><strong>B\u01b0\u1edbc 3:<\/strong> x = 600 th\u1ecfa m\u00e3n. K\u1ebf ho\u1ea1ch l\u00e0 600 s\u1ea3n ph\u1ea9m (d\u1ef1 \u0111\u1ecbnh 15 ng\u00e0y, th\u1ef1c t\u1ebf 12 ng\u00e0y, s\u1edbm 3 ng\u00e0y).<\/li>\n<\/ul>\n<h3>V\u00ed d\u1ee5 5: Hai v\u00f2i n\u01b0\u1edbc c\u00f9ng ch\u1ea3y<\/h3>\n<p><strong>\u0110\u1ec1 b\u00e0i:<\/strong> Hai v\u00f2i n\u01b0\u1edbc c\u00f9ng ch\u1ea3y v\u00e0o m\u1ed9t b\u1ec3 c\u1ea1n th\u00ec sau 6 gi\u1edd \u0111\u1ea7y b\u1ec3. N\u1ebfu ch\u1ea3y ri\u00eang, v\u00f2i th\u1ee9 nh\u1ea5t l\u00e0m \u0111\u1ea7y b\u1ec3 nhanh h\u01a1n v\u00f2i th\u1ee9 hai 5 gi\u1edd. H\u1ecfi m\u1ed7i v\u00f2i ch\u1ea3y ri\u00eang th\u00ec bao l\u00e2u \u0111\u1ea7y b\u1ec3?<\/p>\n<ul>\n<li><strong>B\u01b0\u1edbc 1:<\/strong> G\u1ecdi th\u1eddi gian v\u00f2i th\u1ee9 nh\u1ea5t ch\u1ea3y ri\u00eang \u0111\u1ea7y b\u1ec3 l\u00e0 x (gi\u1edd), x &gt; 6. V\u00f2i th\u1ee9 hai c\u1ea7n x + 5 gi\u1edd. Trong 1 gi\u1edd, hai v\u00f2i ch\u1ea3y \u0111\u01b0\u1ee3c 1\/x + 1\/(x + 5) b\u1ec3, b\u1eb1ng 1\/6 b\u1ec3: 1\/x + 1\/(x + 5) = 1\/6.<\/li>\n<li><strong>B\u01b0\u1edbc 2:<\/strong> Nh\u00e2n hai v\u1ebf v\u1edbi 6x(x + 5): 6(x + 5) + 6x = x(x + 5) \u21d4 x\u00b2 \u2212 7x \u2212 30 = 0 \u21d4 (x \u2212 10)(x + 3) = 0 \u21d4 x = 10 ho\u1eb7c x = \u22123.<\/li>\n<li><strong>B\u01b0\u1edbc 3:<\/strong> x = \u22123 kh\u00f4ng th\u1ecfa m\u00e3n \u0111i\u1ec1u ki\u1ec7n n\u00ean lo\u1ea1i. V\u00f2i th\u1ee9 nh\u1ea5t c\u1ea7n 10 gi\u1edd, v\u00f2i th\u1ee9 hai c\u1ea7n 15 gi\u1edd. Ki\u1ec3m tra: 1\/10 + 1\/15 = 1\/6, \u0111\u00fang.<\/li>\n<\/ul>\n<h2>V\u00ed d\u1ee5 d\u1ea1ng to\u00e1n s\u1ed1 h\u1ecdc, t\u00ecm s\u1ed1<\/h2>\n<p>V\u1edbi b\u00e0i t\u00ecm s\u1ed1, h\u00e3y vi\u1ebft s\u1ed1 d\u01b0\u1edbi d\u1ea1ng t\u1ed5ng theo h\u00e0ng (10a + b) v\u00e0 ch\u00fa \u00fd \u0111i\u1ec1u ki\u1ec7n c\u1ee7a t\u1eebng ch\u1eef s\u1ed1.<\/p>\n<h3>V\u00ed d\u1ee5 6: B\u00e0i to\u00e1n g\u00e0 v\u00e0 ch\u00f3<\/h3>\n<p><strong>\u0110\u1ec1 b\u00e0i:<\/strong> V\u1eeba g\u00e0 v\u1eeba ch\u00f3 c\u00f3 36 con, t\u1ed5ng c\u1ed9ng 100 ch\u00e2n. H\u1ecfi c\u00f3 bao nhi\u00eau con g\u00e0, bao nhi\u00eau con ch\u00f3?<\/p>\n<ul>\n<li><strong>B\u01b0\u1edbc 1:<\/strong> G\u1ecdi s\u1ed1 g\u00e0 l\u00e0 x (con), x nguy\u00ean d\u01b0\u01a1ng, x &lt; 36. S\u1ed1 ch\u00f3 l\u00e0 36 \u2212 x. S\u1ed1 ch\u00e2n g\u00e0 l\u00e0 2x, s\u1ed1 ch\u00e2n ch\u00f3 l\u00e0 4(36 \u2212 x). Ph\u01b0\u01a1ng tr\u00ecnh: 2x + 4(36 \u2212 x) = 100.<\/li>\n<li><strong>B\u01b0\u1edbc 2:<\/strong> 2x + 144 \u2212 4x = 100 \u21d4 \u22122x = \u221244 \u21d4 x = 22.<\/li>\n<li><strong>B\u01b0\u1edbc 3:<\/strong> x = 22 th\u1ecfa m\u00e3n. V\u1eady c\u00f3 22 con g\u00e0 v\u00e0 14 con ch\u00f3.<\/li>\n<\/ul>\n<h3>V\u00ed d\u1ee5 7: T\u00ecm s\u1ed1 c\u00f3 hai ch\u1eef s\u1ed1<\/h3>\n<p><strong>\u0110\u1ec1 b\u00e0i:<\/strong> M\u1ed9t s\u1ed1 c\u00f3 hai ch\u1eef s\u1ed1, ch\u1eef s\u1ed1 h\u00e0ng ch\u1ee5c l\u1edbn h\u01a1n ch\u1eef s\u1ed1 h\u00e0ng \u0111\u01a1n v\u1ecb 3. N\u1ebfu \u0111\u1ed5i ch\u1ed7 hai ch\u1eef s\u1ed1 th\u00ec \u0111\u01b0\u1ee3c s\u1ed1 m\u1edbi b\u1eb1ng 4\/7 s\u1ed1 ban \u0111\u1ea7u. T\u00ecm s\u1ed1 ban \u0111\u1ea7u.<\/p>\n<ul>\n<li><strong>B\u01b0\u1edbc 1:<\/strong> G\u1ecdi ch\u1eef s\u1ed1 h\u00e0ng \u0111\u01a1n v\u1ecb l\u00e0 x, x nguy\u00ean, 0 \u2264 x \u2264 6. Ch\u1eef s\u1ed1 h\u00e0ng ch\u1ee5c l\u00e0 x + 3. S\u1ed1 ban \u0111\u1ea7u: 10(x + 3) + x = 11x + 30. S\u1ed1 m\u1edbi: 10x + (x + 3) = 11x + 3. Ph\u01b0\u01a1ng tr\u00ecnh: 11x + 3 = 4\/7 \u00d7 (11x + 30).<\/li>\n<li><strong>B\u01b0\u1edbc 2:<\/strong> Nh\u00e2n hai v\u1ebf v\u1edbi 7: 77x + 21 = 44x + 120 \u21d4 33x = 99 \u21d4 x = 3.<\/li>\n<li><strong>B\u01b0\u1edbc 3:<\/strong> x = 3 th\u1ecfa m\u00e3n. S\u1ed1 ban \u0111\u1ea7u l\u00e0 63 (s\u1ed1 m\u1edbi 36 = 4\/7 \u00d7 63, \u0111\u00fang).<\/li>\n<\/ul>\n<h3>V\u00ed d\u1ee5 8: B\u00e0i to\u00e1n tu\u1ed5i<\/h3>\n<p><strong>\u0110\u1ec1 b\u00e0i:<\/strong> M\u1eb9 h\u01a1n con 24 tu\u1ed5i. Hai n\u0103m n\u1eefa, tu\u1ed5i m\u1eb9 g\u1ea5p 3 l\u1ea7n tu\u1ed5i con. T\u00ednh tu\u1ed5i con hi\u1ec7n nay.<\/p>\n<ul>\n<li><strong>B\u01b0\u1edbc 1:<\/strong> G\u1ecdi tu\u1ed5i con hi\u1ec7n nay l\u00e0 x (tu\u1ed5i), x nguy\u00ean d\u01b0\u01a1ng. Tu\u1ed5i m\u1eb9 l\u00e0 x + 24. Hai n\u0103m n\u1eefa: con x + 2 tu\u1ed5i, m\u1eb9 x + 26 tu\u1ed5i. Ph\u01b0\u01a1ng tr\u00ecnh: x + 26 = 3(x + 2).<\/li>\n<li><strong>B\u01b0\u1edbc 2:<\/strong> x + 26 = 3x + 6 \u21d4 2x = 20 \u21d4 x = 10.<\/li>\n<li><strong>B\u01b0\u1edbc 3:<\/strong> Con 10 tu\u1ed5i, m\u1eb9 34 tu\u1ed5i. Ki\u1ec3m tra: 2 n\u0103m n\u1eefa con 12, m\u1eb9 36 = 3 \u00d7 12, \u0111\u00fang.<\/li>\n<\/ul>\n<h2>V\u00ed d\u1ee5 d\u1ea1ng to\u00e1n h\u00ecnh h\u1ecdc<\/h2>\n<p>B\u00e0i h\u00ecnh h\u1ecdc th\u01b0\u1eddng d\u1ef1a v\u00e0o c\u00f4ng th\u1ee9c chu vi, di\u1ec7n t\u00edch; khi di\u1ec7n t\u00edch tham gia, ph\u01b0\u01a1ng tr\u00ecnh hay tr\u1edf th\u00e0nh b\u1eadc hai.<\/p>\n<h3>V\u00ed d\u1ee5 9: Bi\u1ebft chu vi<\/h3>\n<p><strong>\u0110\u1ec1 b\u00e0i:<\/strong> M\u1ed9t khu v\u01b0\u1eddn h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 chu vi 280 m, chi\u1ec1u d\u00e0i h\u01a1n chi\u1ec1u r\u1ed9ng 20 m. T\u00ednh di\u1ec7n t\u00edch khu v\u01b0\u1eddn.<\/p>\n<ul>\n<li><strong>B\u01b0\u1edbc 1:<\/strong> G\u1ecdi chi\u1ec1u r\u1ed9ng l\u00e0 x (m), 0 &lt; x &lt; 140. Chi\u1ec1u d\u00e0i l\u00e0 x + 20. N\u1eeda chu vi l\u00e0 140 m, n\u00ean x + (x + 20) = 140.<\/li>\n<li><strong>B\u01b0\u1edbc 2:<\/strong> 2x + 20 = 140 \u21d4 x = 60.<\/li>\n<li><strong>B\u01b0\u1edbc 3:<\/strong> Chi\u1ec1u r\u1ed9ng 60 m, chi\u1ec1u d\u00e0i 80 m. Di\u1ec7n t\u00edch: 60 \u00d7 80 = 4.800 m\u00b2.<\/li>\n<\/ul>\n<h3>V\u00ed d\u1ee5 10: Bi\u1ebft di\u1ec7n t\u00edch<\/h3>\n<p><strong>\u0110\u1ec1 b\u00e0i:<\/strong> M\u1ed9t m\u1ea3nh \u0111\u1ea5t h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 chi\u1ec1u d\u00e0i h\u01a1n chi\u1ec1u r\u1ed9ng 6 m v\u00e0 di\u1ec7n t\u00edch 112 m\u00b2. T\u00ednh c\u00e1c k\u00edch th\u01b0\u1edbc c\u1ee7a m\u1ea3nh \u0111\u1ea5t.<\/p>\n<ul>\n<li><strong>B\u01b0\u1edbc 1:<\/strong> G\u1ecdi chi\u1ec1u r\u1ed9ng l\u00e0 x (m), x &gt; 0. Chi\u1ec1u d\u00e0i l\u00e0 x + 6. Ph\u01b0\u01a1ng tr\u00ecnh: x(x + 6) = 112 \u21d4 x\u00b2 + 6x \u2212 112 = 0.<\/li>\n<li><strong>B\u01b0\u1edbc 2:<\/strong> \u0394&#8217; = 3\u00b2 + 112 = 121, \u221a\u0394&#8217; = 11. Nghi\u1ec7m: x = \u22123 + 11 = 8 ho\u1eb7c x = \u22123 \u2212 11 = \u221214.<\/li>\n<li><strong>B\u01b0\u1edbc 3:<\/strong> x = \u221214 b\u1ecb lo\u1ea1i. Chi\u1ec1u r\u1ed9ng 8 m, chi\u1ec1u d\u00e0i 14 m (8 \u00d7 14 = 112, \u0111\u00fang).<\/li>\n<\/ul>\n<p>V\u1edbi ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai nh\u01b0 v\u00ed d\u1ee5 5 v\u00e0 10, b\u1ea1n c\u00f3 th\u1ec3 xem l\u1ea1i c\u00e1ch d\u00f9ng <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/delta-delta-phay\/\">c\u00f4ng th\u1ee9c Delta v\u00e0 Delta ph\u1ea9y<\/a>. C\u00f2n khi \u0111\u1ec1 c\u00f3 hai \u1ea9n v\u1edbi hai m\u1ed1i quan h\u1ec7, h\u00e3y chuy\u1ec3n sang gi\u1ea3i b\u1eb1ng <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/he-phuong-trinh\/\">h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh<\/a>.<\/p>\n<h2>L\u1ed7i th\u01b0\u1eddng g\u1eb7p khi gi\u1ea3i b\u00e0i to\u00e1n b\u1eb1ng c\u00e1ch l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh<\/h2>\n<p>Ph\u1ea7n l\u1edbn l\u1ed7i m\u1ea5t \u0111i\u1ec3m kh\u00f4ng n\u1eb1m \u1edf b\u01b0\u1edbc gi\u1ea3i m\u00e0 \u1edf b\u01b0\u1edbc \u0111\u1eb7t \u1ea9n v\u00e0 k\u1ebft lu\u1eadn.<\/p>\n<ul>\n<li>Qu\u00ean \u0111\u1eb7t \u0111i\u1ec1u ki\u1ec7n cho \u1ea9n ho\u1eb7c \u0111\u1eb7t sai \u0111i\u1ec1u ki\u1ec7n.<\/li>\n<li>Kh\u00f4ng ghi \u0111\u01a1n v\u1ecb c\u1ee7a \u1ea9n v\u00e0 c\u1ee7a \u0111\u00e1p s\u1ed1.<\/li>\n<li>Qu\u00ean \u0111\u1ed1i chi\u1ebfu nghi\u1ec7m, nh\u1ea5t l\u00e0 khi ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai c\u00f3 2 nghi\u1ec7m.<\/li>\n<li>\u0110\u1ed5i \u0111\u01a1n v\u1ecb kh\u00f4ng th\u1ed1ng nh\u1ea5t (ph\u00fat v\u00e0 gi\u1edd, m\u00e9t v\u00e0 kil\u00f4m\u00e9t).<\/li>\n<li>Nh\u1ea7m th\u1eddi gian &quot;s\u1edbm h\u01a1n&quot; v\u00e0 &quot;mu\u1ed9n h\u01a1n&quot; khi l\u1eadp hi\u1ec7u.<\/li>\n<li>Tr\u1ea3 l\u1eddi thi\u1ebfu: \u0111\u1ec1 h\u1ecfi di\u1ec7n t\u00edch nh\u01b0ng ch\u1ec9 ghi chi\u1ec1u r\u1ed9ng.<\/li>\n<\/ul>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-624301\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/cac-buoc-giai-bai-toan-bang-cach-lap-phuong-trinh-2.jpg\" alt=\"cac-buoc-giai-bai-toan-bang-cach-lap-phuong-trinh-2\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/cac-buoc-giai-bai-toan-bang-cach-lap-phuong-trinh-2.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/cac-buoc-giai-bai-toan-bang-cach-lap-phuong-trinh-2-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/11\/cac-buoc-giai-bai-toan-bang-cach-lap-phuong-trinh-2-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2>\n<h3>Gi\u1ea3i b\u00e0i to\u00e1n b\u1eb1ng c\u00e1ch l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh g\u1ed3m m\u1ea5y b\u01b0\u1edbc?<\/h3>\n<p>G\u1ed3m 3 b\u01b0\u1edbc: l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh (ch\u1ecdn \u1ea9n, \u0111\u1eb7t \u0111i\u1ec1u ki\u1ec7n, bi\u1ec3u di\u1ec5n \u0111\u1ea1i l\u01b0\u1ee3ng, l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh), gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh v\u00e0 tr\u1ea3 l\u1eddi.<\/p>\n<h3>N\u00ean ch\u1ecdn \u1ea9n nh\u01b0 th\u1ebf n\u00e0o?<\/h3>\n<p>Th\u01b0\u1eddng ch\u1ecdn ch\u00ednh \u0111\u1ea1i l\u01b0\u1ee3ng \u0111\u1ec1 b\u00e0i h\u1ecfi l\u00e0m \u1ea9n. N\u1ebfu c\u00e1ch \u0111\u00f3 khi\u1ebfn ph\u01b0\u01a1ng tr\u00ecnh r\u1eafc r\u1ed1i, b\u1ea1n c\u00f3 th\u1ec3 ch\u1ecdn m\u1ed9t \u0111\u1ea1i l\u01b0\u1ee3ng trung gian r\u1ed3i t\u00ednh \u0111\u1ea1i l\u01b0\u1ee3ng c\u1ea7n t\u00ecm sau.<\/p>\n<h3>V\u00ec sao ph\u1ea3i \u0111\u1eb7t \u0111i\u1ec1u ki\u1ec7n cho \u1ea9n?<\/h3>\n<p>\u0110i\u1ec1u ki\u1ec7n gi\u00fap lo\u1ea1i c\u00e1c nghi\u1ec7m kh\u00f4ng ph\u00f9 h\u1ee3p th\u1ef1c t\u1ebf, ch\u1eb3ng h\u1ea1n s\u1ed1 \u00e2m, s\u1ed1 kh\u00f4ng nguy\u00ean ho\u1eb7c ch\u1eef s\u1ed1 l\u1edbn h\u01a1n 9.<\/p>\n<h3>D\u1ea1ng to\u00e1n n\u00e0y h\u1ecdc \u1edf l\u1edbp m\u1ea5y?<\/h3>\n<p>Theo ch\u01b0\u01a1ng tr\u00ecnh hi\u1ec7n h\u00e0nh, h\u1ecdc sinh l\u00e0m quen v\u1edbi ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc nh\u1ea5t \u1edf To\u00e1n 8 v\u00e0 m\u1edf r\u1ed9ng sang ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai, h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh \u1edf To\u00e1n 9.<\/p>\n<h3>Khi ph\u01b0\u01a1ng tr\u00ecnh c\u00f3 hai nghi\u1ec7m th\u00ec ch\u1ecdn nghi\u1ec7m n\u00e0o?<\/h3>\n<p>Ch\u1ecdn nghi\u1ec7m th\u1ecfa m\u00e3n \u0111i\u1ec1u ki\u1ec7n c\u1ee7a \u1ea9n v\u00e0 ph\u00f9 h\u1ee3p v\u1edbi \u0111\u1ec1 b\u00e0i; nghi\u1ec7m c\u00f2n l\u1ea1i ph\u1ea3i ghi r\u00f5 l\u00e0 b\u1ecb lo\u1ea1i.<\/p>\n<h3>Khi n\u00e0o n\u00ean d\u00f9ng h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh thay v\u00ec ph\u01b0\u01a1ng tr\u00ecnh?<\/h3>\n<p>Khi \u0111\u1ec1 c\u00f3 hai \u0111\u1ea1i l\u01b0\u1ee3ng ch\u01b0a bi\u1ebft v\u00e0 hai m\u1ed1i quan h\u1ec7 \u0111\u1ed9c l\u1eadp, \u0111\u1eb7t hai \u1ea9n v\u00e0 l\u1eadp h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh th\u01b0\u1eddng d\u1ec5 h\u01a1n so v\u1edbi c\u1ed1 bi\u1ec3u di\u1ec5n m\u1ecdi th\u1ee9 theo m\u1ed9t \u1ea9n.<br \/>\n<script type=\"application\/ld+json\">{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Gi\u1ea3i b\u00e0i to\u00e1n b\u1eb1ng c\u00e1ch l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh g\u1ed3m m\u1ea5y b\u01b0\u1edbc?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"G\u1ed3m 3 b\u01b0\u1edbc: l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh (ch\u1ecdn \u1ea9n, \u0111\u1eb7t \u0111i\u1ec1u ki\u1ec7n, bi\u1ec3u di\u1ec5n \u0111\u1ea1i l\u01b0\u1ee3ng, l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh), gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh v\u00e0 tr\u1ea3 l\u1eddi.\"}}, {\"@type\": \"Question\", \"name\": \"N\u00ean ch\u1ecdn \u1ea9n nh\u01b0 th\u1ebf n\u00e0o?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Th\u01b0\u1eddng ch\u1ecdn ch\u00ednh \u0111\u1ea1i l\u01b0\u1ee3ng \u0111\u1ec1 b\u00e0i h\u1ecfi l\u00e0m \u1ea9n. N\u1ebfu c\u00e1ch \u0111\u00f3 khi\u1ebfn ph\u01b0\u01a1ng tr\u00ecnh r\u1eafc r\u1ed1i, b\u1ea1n c\u00f3 th\u1ec3 ch\u1ecdn m\u1ed9t \u0111\u1ea1i l\u01b0\u1ee3ng trung gian r\u1ed3i t\u00ednh \u0111\u1ea1i l\u01b0\u1ee3ng c\u1ea7n t\u00ecm sau.\"}}, {\"@type\": \"Question\", \"name\": \"V\u00ec sao ph\u1ea3i \u0111\u1eb7t \u0111i\u1ec1u ki\u1ec7n cho \u1ea9n?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"\u0110i\u1ec1u ki\u1ec7n gi\u00fap lo\u1ea1i c\u00e1c nghi\u1ec7m kh\u00f4ng ph\u00f9 h\u1ee3p th\u1ef1c t\u1ebf, ch\u1eb3ng h\u1ea1n s\u1ed1 \u00e2m, s\u1ed1 kh\u00f4ng nguy\u00ean ho\u1eb7c ch\u1eef s\u1ed1 l\u1edbn h\u01a1n 9.\"}}, {\"@type\": \"Question\", \"name\": \"D\u1ea1ng to\u00e1n n\u00e0y h\u1ecdc \u1edf l\u1edbp m\u1ea5y?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Theo ch\u01b0\u01a1ng tr\u00ecnh hi\u1ec7n h\u00e0nh, h\u1ecdc sinh l\u00e0m quen v\u1edbi ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc nh\u1ea5t \u1edf To\u00e1n 8 v\u00e0 m\u1edf r\u1ed9ng sang ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai, h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh \u1edf To\u00e1n 9.\"}}, {\"@type\": \"Question\", \"name\": \"Khi ph\u01b0\u01a1ng tr\u00ecnh c\u00f3 hai nghi\u1ec7m th\u00ec ch\u1ecdn nghi\u1ec7m n\u00e0o?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Ch\u1ecdn nghi\u1ec7m th\u1ecfa m\u00e3n \u0111i\u1ec1u ki\u1ec7n c\u1ee7a \u1ea9n v\u00e0 ph\u00f9 h\u1ee3p v\u1edbi \u0111\u1ec1 b\u00e0i; nghi\u1ec7m c\u00f2n l\u1ea1i ph\u1ea3i ghi r\u00f5 l\u00e0 b\u1ecb lo\u1ea1i.\"}}, {\"@type\": \"Question\", \"name\": \"Khi n\u00e0o n\u00ean d\u00f9ng h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh thay v\u00ec ph\u01b0\u01a1ng tr\u00ecnh?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Khi \u0111\u1ec1 c\u00f3 hai \u0111\u1ea1i l\u01b0\u1ee3ng ch\u01b0a bi\u1ebft v\u00e0 hai m\u1ed1i quan h\u1ec7 \u0111\u1ed9c l\u1eadp, \u0111\u1eb7t hai \u1ea9n v\u00e0 l\u1eadp h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh th\u01b0\u1eddng d\u1ec5 h\u01a1n so v\u1edbi c\u1ed1 bi\u1ec3u di\u1ec5n m\u1ecdi th\u1ee9 theo m\u1ed9t \u1ea9n.\"}}]}<\/script><\/p>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p>Gi\u1ea3i b\u00e0i to\u00e1n b\u1eb1ng c\u00e1ch l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh lu\u00f4n g\u1ed3m 3 b\u01b0\u1edbc: l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh, gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh v\u00e0 tr\u1ea3 l\u1eddi. Ph\u1ea7n quy\u1ebft \u0111\u1ecbnh l\u00e0 ch\u1ecdn \u1ea9n, \u0111\u1eb7t \u0111i\u1ec1u ki\u1ec7n v\u00e0 bi\u1ec3u di\u1ec5n \u0111\u00fang c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng theo \u1ea9n d\u1ef1a tr\u00ean m\u1ed1i quan h\u1ec7 c\u1ee7a t\u1eebng d\u1ea1ng to\u00e1n. H\u00e3y luy\u1ec7n l\u1ea7n l\u01b0\u1ee3t c\u00e1c d\u1ea1ng chuy\u1ec3n \u0111\u1ed9ng, n\u0103ng su\u1ea5t, s\u1ed1 h\u1ecdc v\u00e0 h\u00ecnh h\u1ecdc, \u0111\u1ed3ng th\u1eddi lu\u00f4n ki\u1ec3m tra l\u1ea1i nghi\u1ec7m v\u1edbi \u0111\u1ec1 b\u00e0i \u0111\u1ec3 kh\u00f4ng m\u1ea5t \u0111i\u1ec3m \u0111\u00e1ng ti\u1ebfc.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Mu\u1ed1n gi\u1ea3i b\u00e0i to\u00e1n b\u1eb1ng c\u00e1ch l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh, b\u1ea1n ch\u1ec9 c\u1ea7n nh\u1edb 3 b\u01b0\u1edbc: (1) l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh \u2013 ch\u1ecdn \u1ea9n, \u0111\u1eb7t \u0111i\u1ec1u ki\u1ec7n, bi\u1ec3u di\u1ec5n c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng ch\u01b0a bi\u1ebft theo \u1ea9n r\u1ed3i l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh; (2) gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh; (3) tr\u1ea3 l\u1eddi \u2013 \u0111\u1ed1i chi\u1ebfu nghi\u1ec7m v\u1edbi \u0111i\u1ec1u ki\u1ec7n v\u00e0 k\u1ebft lu\u1eadn. [&hellip;]<\/p>\n","protected":false},"author":102,"featured_media":624302,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"gi\u1ea3i b\u00e0i to\u00e1n b\u1eb1ng c\u00e1ch l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh","_yoast_wpseo_title":"C\u00e1c b\u01b0\u1edbc gi\u1ea3i b\u00e0i to\u00e1n b\u1eb1ng c\u00e1ch l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh v\u00e0 v\u00ed d\u1ee5","_yoast_wpseo_metadesc":"C\u00e1c b\u01b0\u1edbc gi\u1ea3i b\u00e0i to\u00e1n b\u1eb1ng c\u00e1ch l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh k\u00e8m b\u1ea3ng c\u00f4ng th\u1ee9c v\u00e0 10 v\u00ed d\u1ee5 c\u00f3 l\u1eddi gi\u1ea3i: chuy\u1ec3n \u0111\u1ed9ng, n\u0103ng su\u1ea5t, t\u00ecm s\u1ed1, h\u00ecnh h\u1ecdc. Luy\u1ec7n t\u1eadp ngay!","footnotes":""},"categories":[3910,30453],"tags":[],"class_list":["post-624298","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 v27.3 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>C\u00e1c b\u01b0\u1edbc gi\u1ea3i b\u00e0i to\u00e1n b\u1eb1ng c\u00e1ch l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh v\u00e0 v\u00ed d\u1ee5<\/title>\n<meta name=\"description\" content=\"C\u00e1c b\u01b0\u1edbc gi\u1ea3i b\u00e0i to\u00e1n b\u1eb1ng c\u00e1ch l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh k\u00e8m b\u1ea3ng c\u00f4ng th\u1ee9c v\u00e0 10 v\u00ed d\u1ee5 c\u00f3 l\u1eddi gi\u1ea3i: chuy\u1ec3n \u0111\u1ed9ng, n\u0103ng su\u1ea5t, t\u00ecm s\u1ed1, h\u00ecnh h\u1ecdc. 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