{"id":570083,"date":"2026-07-24T13:06:19","date_gmt":"2026-07-24T06:06:19","guid":{"rendered":"https:\/\/hoanghamobile.com\/tin-tuc\/?p=570083"},"modified":"2026-08-25T16:12:52","modified_gmt":"2026-08-25T09:12:52","slug":"hon-so-la-gi","status":"publish","type":"post","link":"https:\/\/hoanghamobile.com\/tin-tuc\/hon-so-la-gi\/","title":{"rendered":"H\u1ed7n s\u1ed1 l\u00e0 g\u00ec? C\u00e1ch chuy\u1ec3n h\u1ed7n s\u1ed1 th\u00e0nh ph\u00e2n s\u1ed1 v\u00e0 b\u00e0i t\u1eadp"},"content":{"rendered":"<p><strong>H\u1ed7n s\u1ed1 l\u00e0 s\u1ed1 \u0111\u01b0\u1ee3c vi\u1ebft d\u01b0\u1edbi d\u1ea1ng g\u1ed3m hai ph\u1ea7n: m\u1ed9t ph\u1ea7n nguy\u00ean v\u00e0 m\u1ed9t ph\u1ea7n ph\u00e2n s\u1ed1 nh\u1ecf h\u01a1n 1, v\u00ed d\u1ee5 2\u00bd (\u0111\u1ecdc l\u00e0 hai v\u00e0 m\u1ed9t ph\u1ea7n hai).<\/strong> C\u00e1ch vi\u1ebft n\u00e0y th\u01b0\u1eddng d\u00f9ng \u0111\u1ec3 bi\u1ec3u di\u1ec5n ph\u00e2n s\u1ed1 l\u1edbn h\u01a1n 1 m\u1ed9t c\u00e1ch tr\u1ef1c quan h\u01a1n. \u0110\u00e2y l\u00e0 ki\u1ebfn th\u1ee9c To\u00e1n ti\u1ec3u h\u1ecdc v\u00e0 l\u1edbp 6, l\u00e0m n\u1ec1n cho ph\u1ea7n ph\u00e2n s\u1ed1 \u1edf c\u00e1c l\u1edbp tr\u00ean. B\u00e0i vi\u1ebft n\u00e0y tr\u00ecnh b\u00e0y h\u1ed7n s\u1ed1 l\u00e0 g\u00ec, c\u00e1ch chuy\u1ec3n th\u00e0nh ph\u00e2n s\u1ed1 v\u00e0 ng\u01b0\u1ee3c l\u1ea1i, c\u00e1ch c\u1ed9ng tr\u1eeb nh\u00e2n chia h\u1ed7n s\u1ed1 c\u00f9ng nhi\u1ec1u b\u00e0i t\u1eadp c\u00f3 l\u1eddi gi\u1ea3i t\u1eebng b\u01b0\u1edbc \u0111\u1ec3 b\u1ea1n luy\u1ec7n t\u1eadp.<\/p>\n<h2>H\u1ed7n s\u1ed1 l\u00e0 g\u00ec?<\/h2>\n<p>H\u1ed7n s\u1ed1 l\u00e0 s\u1ed1 g\u1ed3m hai ph\u1ea7n: ph\u1ea7n nguy\u00ean v\u00e0 ph\u1ea7n ph\u00e2n s\u1ed1, trong \u0111\u00f3 ph\u1ea7n ph\u00e2n s\u1ed1 lu\u00f4n nh\u1ecf h\u01a1n 1. V\u00ed d\u1ee5, 3\u00bc g\u1ed3m ph\u1ea7n nguy\u00ean l\u00e0 3 v\u00e0 ph\u1ea7n ph\u00e2n s\u1ed1 l\u00e0 \u00bc. C\u00e1ch vi\u1ebft n\u00e0y gi\u00fap bi\u1ec3u di\u1ec5n c\u00e1c ph\u00e2n s\u1ed1 l\u1edbn h\u01a1n 1 m\u1ed9t c\u00e1ch tr\u1ef1c quan, d\u1ec5 h\u00ecnh dung v\u1ec1 m\u1eb7t s\u1ed1 l\u01b0\u1ee3ng. Ta \u0111\u1ecdc h\u1ed7n s\u1ed1 b\u1eb1ng c\u00e1ch n\u00eau ph\u1ea7n nguy\u00ean tr\u01b0\u1edbc, th\u00eam ch\u1eef &#8220;v\u00e0&#8221; r\u1ed3i \u0111\u1ecdc ph\u1ea7n ph\u00e2n s\u1ed1: 3\u00bc \u0111\u1ecdc l\u00e0 &#8220;ba v\u00e0 m\u1ed9t ph\u1ea7n t\u01b0&#8221;, 2\u2154 \u0111\u1ecdc l\u00e0 &#8220;hai v\u00e0 hai ph\u1ea7n ba&#8221;. M\u1ed7i h\u1ed7n s\u1ed1 lu\u00f4n c\u00f3 gi\u00e1 tr\u1ecb l\u1edbn h\u01a1n ph\u1ea7n nguy\u00ean v\u00e0 nh\u1ecf h\u01a1n s\u1ed1 nguy\u00ean li\u1ec1n sau n\u00f3.<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter size-full wp-image-570088\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/hon-so-1.jpg\" alt=\"H\u1ed7n s\u1ed1 l\u00e0 g\u00ec? C\u00e1ch chuy\u1ec3n h\u1ed7n s\u1ed1 th\u00e0nh ph\u00e2n s\u1ed1 v\u00e0 b\u00e0i t\u1eadp - h\u1ed7n s\u1ed1 l\u00e0 g\u00ec\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/hon-so-1.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/hon-so-1-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/hon-so-1-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>C\u1ea5u t\u1ea1o v\u00e0 \u0111i\u1ec1u ki\u1ec7n c\u1ee7a m\u1ed9t h\u1ed7n s\u1ed1<\/h2>\n<p>M\u1ed9t h\u1ed7n s\u1ed1 h\u1ee3p l\u1ec7 ph\u1ea3i th\u1ecfa m\u00e3n hai \u0111i\u1ec1u ki\u1ec7n: ph\u1ea7n nguy\u00ean l\u00e0 s\u1ed1 nguy\u00ean v\u00e0 ph\u1ea7n ph\u00e2n s\u1ed1 l\u00e0 ph\u00e2n s\u1ed1 d\u01b0\u01a1ng nh\u1ecf h\u01a1n 1 (t\u1eed s\u1ed1 nh\u1ecf h\u01a1n m\u1eabu s\u1ed1). B\u1ea3ng d\u01b0\u1edbi \u0111\u00e2y t\u00f3m t\u1eaft c\u00e1c th\u00e0nh ph\u1ea7n \u0111\u1ec3 b\u1ea1n d\u1ec5 tra c\u1ee9u:<\/p>\n<table>\n<thead>\n<tr>\n<th>Th\u00e0nh ph\u1ea7n<\/th>\n<th>\u00dd ngh\u0129a<\/th>\n<th>V\u00ed d\u1ee5 \u1edf h\u1ed7n s\u1ed1 3\u00bc<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Ph\u1ea7n nguy\u00ean<\/td>\n<td>S\u1ed1 nguy\u00ean \u0111\u1ee9ng tr\u01b0\u1edbc<\/td>\n<td>3<\/td>\n<\/tr>\n<tr>\n<td>T\u1eed s\u1ed1<\/td>\n<td>S\u1ed1 \u1edf tr\u00ean c\u1ee7a ph\u1ea7n ph\u00e2n s\u1ed1<\/td>\n<td>1<\/td>\n<\/tr>\n<tr>\n<td>M\u1eabu s\u1ed1<\/td>\n<td>S\u1ed1 \u1edf d\u01b0\u1edbi c\u1ee7a ph\u1ea7n ph\u00e2n s\u1ed1<\/td>\n<td>4<\/td>\n<\/tr>\n<tr>\n<td>\u0110i\u1ec1u ki\u1ec7n<\/td>\n<td>Ph\u1ea7n ph\u00e2n s\u1ed1 nh\u1ecf h\u01a1n 1<\/td>\n<td>\u00bc &lt; 1 (\u0111\u00fang)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>N\u1ebfu ph\u1ea7n ph\u00e2n s\u1ed1 b\u1eb1ng ho\u1eb7c l\u1edbn h\u01a1n 1 th\u00ec \u0111\u00f3 ch\u01b0a ph\u1ea3i h\u1ed7n s\u1ed1 \u0111\u00e3 r\u00fat g\u1ecdn; ta c\u1ea7n \u0111\u1ed5i b\u1edbt sang ph\u1ea7n nguy\u00ean. V\u00ed d\u1ee5 2 5\/4 ph\u1ea3i vi\u1ebft l\u1ea1i th\u00e0nh 3\u00bc v\u00ec 5\/4 = 1\u00bc.<\/p>\n<h2>C\u00e1ch chuy\u1ec3n h\u1ed7n s\u1ed1 th\u00e0nh ph\u00e2n s\u1ed1<\/h2>\n<p>\u0110\u1ec3 chuy\u1ec3n m\u1ed9t h\u1ed7n s\u1ed1 th\u00e0nh ph\u00e2n s\u1ed1, ta l\u00e0m theo quy t\u1eafc: l\u1ea5y ph\u1ea7n nguy\u00ean nh\u00e2n v\u1edbi m\u1eabu s\u1ed1, c\u1ed9ng th\u00eam t\u1eed s\u1ed1, gi\u1eef nguy\u00ean m\u1eabu s\u1ed1.<\/p>\n<p><strong>a b\/c = (a \u00d7 c + b) \/ c<\/strong><\/p>\n<p>V\u00ed d\u1ee5: 2\u00be = (2 \u00d7 4 + 3)\/4 = 11\/4. T\u01b0\u01a1ng t\u1ef1, 3\u00bd = (3 \u00d7 2 + 1)\/2 = 7\/2. C\u00e1ch l\u00e0m n\u00e0y r\u1ea5t ti\u1ec7n khi b\u1ea1n c\u1ea7n c\u1ed9ng, tr\u1eeb, nh\u00e2n, chia v\u00ec m\u1ecdi ph\u00e9p t\u00ednh \u0111\u1ec1u d\u1ec5 th\u1ef1c hi\u1ec7n h\u01a1n tr\u00ean ph\u00e2n s\u1ed1 so v\u1edbi tr\u00ean h\u1ed7n s\u1ed1.<\/p>\n<h2>C\u00e1ch chuy\u1ec3n ph\u00e2n s\u1ed1 th\u00e0nh h\u1ed7n s\u1ed1<\/h2>\n<p>\u0110\u1ec3 chuy\u1ec3n m\u1ed9t ph\u00e2n s\u1ed1 l\u1edbn h\u01a1n 1 th\u00e0nh h\u1ed7n s\u1ed1, ta l\u1ea5y t\u1eed s\u1ed1 chia cho m\u1eabu s\u1ed1: th\u01b0\u01a1ng l\u00e0 ph\u1ea7n nguy\u00ean, s\u1ed1 d\u01b0 l\u00e0 t\u1eed s\u1ed1 m\u1edbi, m\u1eabu s\u1ed1 gi\u1eef nguy\u00ean. V\u00ed d\u1ee5: 17\/5 \u2192 17 chia 5 \u0111\u01b0\u1ee3c 3 d\u01b0 2, n\u00ean 17\/5 = 3\u2156. L\u01b0u \u00fd ph\u00e2n s\u1ed1 ph\u1ea3i l\u1edbn h\u01a1n 1 (t\u1eed l\u1edbn h\u01a1n m\u1eabu) th\u00ec m\u1edbi chuy\u1ec3n \u0111\u01b0\u1ee3c th\u00e0nh h\u1ed7n s\u1ed1; n\u1ebfu t\u1eed nh\u1ecf h\u01a1n m\u1eabu th\u00ec ph\u00e2n s\u1ed1 \u0111\u00e3 nh\u1ecf h\u01a1n 1 v\u00e0 kh\u00f4ng c\u00f3 ph\u1ea7n nguy\u00ean.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-570090\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/hon-so-3.jpg\" alt=\"C\u00e1ch chuy\u1ec3n ph\u00e2n s\u1ed1 th\u00e0nh h\u1ed7n s\u1ed1\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/hon-so-3.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/hon-so-3-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/hon-so-3-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>C\u00e1c ph\u00e9p t\u00ednh v\u1edbi h\u1ed7n s\u1ed1<\/h2>\n<p>C\u00e1ch \u0111\u01a1n gi\u1ea3n v\u00e0 \u00edt nh\u1ea7m l\u1eabn nh\u1ea5t l\u00e0 <strong>chuy\u1ec3n h\u1ed7n s\u1ed1 v\u1ec1 ph\u00e2n s\u1ed1<\/strong> r\u1ed3i th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh, cu\u1ed1i c\u00f9ng \u0111\u1ed5i k\u1ebft qu\u1ea3 tr\u1edf l\u1ea1i h\u1ed7n s\u1ed1 n\u1ebfu \u0111\u1ec1 y\u00eau c\u1ea7u:<\/p>\n<ul>\n<li><strong>C\u1ed9ng, tr\u1eeb:<\/strong> chuy\u1ec3n v\u1ec1 ph\u00e2n s\u1ed1, quy \u0111\u1ed3ng m\u1eabu s\u1ed1 r\u1ed3i c\u1ed9ng ho\u1eb7c tr\u1eeb t\u1eed s\u1ed1.<\/li>\n<li><strong>Nh\u00e2n:<\/strong> chuy\u1ec3n v\u1ec1 ph\u00e2n s\u1ed1 r\u1ed3i nh\u00e2n t\u1eed v\u1edbi t\u1eed, m\u1eabu v\u1edbi m\u1eabu.<\/li>\n<li><strong>Chia:<\/strong> chuy\u1ec3n v\u1ec1 ph\u00e2n s\u1ed1 r\u1ed3i nh\u00e2n v\u1edbi ph\u00e2n s\u1ed1 ngh\u1ecbch \u0111\u1ea3o c\u1ee7a s\u1ed1 chia.<\/li>\n<\/ul>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-570089\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/hon-so-2.jpg\" alt=\"H\u1ed7n s\u1ed1 l\u00e0 g\u00ec? C\u00e1ch chuy\u1ec3n h\u1ed7n s\u1ed1 th\u00e0nh ph\u00e2n s\u1ed1 v\u00e0 b\u00e0i t\u1eadp - c\u00e1c ph\u00e9p t\u00ednh v\u1edbi h\u1ed7n s\u1ed1\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/hon-so-2.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/hon-so-2-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/hon-so-2-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>V\u00ed d\u1ee5 t\u00ednh to\u00e1n v\u1edbi h\u1ed7n s\u1ed1 (c\u00f3 l\u1eddi gi\u1ea3i)<\/h2>\n<p>D\u01b0\u1edbi \u0111\u00e2y l\u00e0 hai v\u00ed d\u1ee5 tr\u00ecnh b\u00e0y t\u1eebng b\u01b0\u1edbc \u0111\u1ec3 b\u1ea1n n\u1eafm ch\u1eafc th\u1ee9 t\u1ef1 th\u1ef1c hi\u1ec7n:<\/p>\n<ul>\n<li><strong>V\u00ed d\u1ee5 1 \u2014 ph\u00e9p c\u1ed9ng:<\/strong> T\u00ednh 1\u00bd + 2\u00bc.<br \/>\n  B\u01b0\u1edbc 1: chuy\u1ec3n v\u1ec1 ph\u00e2n s\u1ed1: 1\u00bd = 3\/2, 2\u00bc = 9\/4.<br \/>\n  B\u01b0\u1edbc 2: quy \u0111\u1ed3ng m\u1eabu s\u1ed1: 3\/2 = 6\/4.<br \/>\n  B\u01b0\u1edbc 3: c\u1ed9ng t\u1eed s\u1ed1: 6\/4 + 9\/4 = 15\/4.<br \/>\n  B\u01b0\u1edbc 4: \u0111\u1ed5i l\u1ea1i h\u1ed7n s\u1ed1: 15\/4 = 3\u00be.<\/li>\n<li><strong>V\u00ed d\u1ee5 2 \u2014 ph\u00e9p nh\u00e2n:<\/strong> T\u00ednh 2\u00bd \u00d7 1\u2153.<br \/>\n  B\u01b0\u1edbc 1: chuy\u1ec3n v\u1ec1 ph\u00e2n s\u1ed1: 2\u00bd = 5\/2, 1\u2153 = 4\/3.<br \/>\n  B\u01b0\u1edbc 2: nh\u00e2n t\u1eed v\u1edbi t\u1eed, m\u1eabu v\u1edbi m\u1eabu: (5\u00d74)\/(2\u00d73) = 20\/6.<br \/>\n  B\u01b0\u1edbc 3: r\u00fat g\u1ecdn: 20\/6 = 10\/3.<br \/>\n  B\u01b0\u1edbc 4: \u0111\u1ed5i l\u1ea1i h\u1ed7n s\u1ed1: 10\/3 = 3\u2153.<\/li>\n<\/ul>\n<h2>C\u00e1ch so s\u00e1nh hai h\u1ed7n s\u1ed1<\/h2>\n<p>\u0110\u1ec3 so s\u00e1nh hai h\u1ed7n s\u1ed1, tr\u01b0\u1edbc ti\u00ean ta so s\u00e1nh ph\u1ea7n nguy\u00ean: h\u1ed7n s\u1ed1 n\u00e0o c\u00f3 ph\u1ea7n nguy\u00ean l\u1edbn h\u01a1n th\u00ec l\u1edbn h\u01a1n. N\u1ebfu ph\u1ea7n nguy\u00ean b\u1eb1ng nhau, ta so s\u00e1nh ti\u1ebfp ph\u1ea7n ph\u00e2n s\u1ed1 b\u1eb1ng c\u00e1ch quy \u0111\u1ed3ng m\u1eabu s\u1ed1. V\u00ed d\u1ee5 so s\u00e1nh 2\u2157 v\u00e0 2\u00be: ph\u1ea7n nguy\u00ean \u0111\u1ec1u l\u00e0 2, ta so s\u00e1nh \u2157 v\u00e0 \u00be. Quy \u0111\u1ed3ng: \u2157 = 12\/20 v\u00e0 \u00be = 15\/20, v\u00ec 12\/20 &lt; 15\/20 n\u00ean 2\u2157 &lt; 2\u00be. V\u1edbi h\u1ed7n s\u1ed1 ph\u1ee9c t\u1ea1p, b\u1ea1n c\u0169ng c\u00f3 th\u1ec3 \u0111\u1ed5i c\u1ea3 hai v\u1ec1 ph\u00e2n s\u1ed1 r\u1ed3i so s\u00e1nh tr\u1ef1c ti\u1ebfp.<\/p>\n<h2>B\u00e0i t\u1eadp v\u1eadn d\u1ee5ng c\u00f3 l\u1eddi gi\u1ea3i<\/h2>\n<ul>\n<li><strong>B\u00e0i 1:<\/strong> Chuy\u1ec3n 4\u2156 th\u00e0nh ph\u00e2n s\u1ed1. <em>L\u1eddi gi\u1ea3i:<\/em> (4 \u00d7 5 + 2)\/5 = 22\/5.<\/li>\n<li><strong>B\u00e0i 2:<\/strong> Chuy\u1ec3n 23\/4 th\u00e0nh h\u1ed7n s\u1ed1. <em>L\u1eddi gi\u1ea3i:<\/em> 23 chia 4 \u0111\u01b0\u1ee3c 5 d\u01b0 3, n\u00ean 23\/4 = 5\u00be.<\/li>\n<li><strong>B\u00e0i 3:<\/strong> T\u00ednh 3\u00bd \u2212 1\u00bc. <em>L\u1eddi gi\u1ea3i:<\/em> 7\/2 \u2212 5\/4 = 14\/4 \u2212 5\/4 = 9\/4 = 2\u00bc.<\/li>\n<li><strong>B\u00e0i 4:<\/strong> T\u00ednh 2\u2153 : 1\u2159. <em>L\u1eddi gi\u1ea3i:<\/em> 7\/3 : 7\/6 = 7\/3 \u00d7 6\/7 = 42\/21 = 2.<\/li>\n<li><strong>B\u00e0i 5:<\/strong> T\u00ednh 1\u00bd + 2\u2153. <em>L\u1eddi gi\u1ea3i:<\/em> 3\/2 + 7\/3 = 9\/6 + 14\/6 = 23\/6 = 3\u215a.<\/li>\n<li><strong>B\u00e0i 6 (tr\u1eafc nghi\u1ec7m):<\/strong> 3\u00bd b\u1eb1ng ph\u00e2n s\u1ed1 n\u00e0o? A. 5\/2 B. 7\/2 C. 6\/2 D. 3\/2. <em>\u0110\u00e1p \u00e1n:<\/em> B, v\u00ec (3 \u00d7 2 + 1)\/2 = 7\/2.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-570087\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/hon-so-4.jpg\" alt=\"H\u1ed7n s\u1ed1 l\u00e0 g\u00ec? C\u00e1ch chuy\u1ec3n h\u1ed7n s\u1ed1 th\u00e0nh ph\u00e2n s\u1ed1 v\u00e0 b\u00e0i t\u1eadp - b\u00e0i t\u1eadp v\u1eadn d\u1ee5ng c\u00f3 l\u1eddi gi\u1ea3i\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/hon-so-4.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/hon-so-4-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/hon-so-4-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>Nh\u1eefng l\u1ed7i th\u01b0\u1eddng g\u1eb7p khi l\u00e0m b\u00e0i h\u1ed7n s\u1ed1<\/h2>\n<p>Khi m\u1edbi h\u1ecdc, h\u1ecdc sinh th\u01b0\u1eddng m\u1eafc m\u1ed9t s\u1ed1 l\u1ed7i sau:<\/p>\n<ul>\n<li><strong>Qu\u00ean c\u1ed9ng t\u1eed s\u1ed1:<\/strong> ch\u1ec9 nh\u00e2n ph\u1ea7n nguy\u00ean v\u1edbi m\u1eabu m\u00e0 qu\u00ean c\u1ed9ng t\u1eed, khi\u1ebfn 2\u00be b\u1ecb nh\u1ea7m th\u00e0nh 8\/4 thay v\u00ec 11\/4.<\/li>\n<li><strong>C\u1ed9ng th\u1eb3ng hai ph\u1ea7n nguy\u00ean v\u00e0 hai ph\u00e2n s\u1ed1 ri\u00eang:<\/strong> v\u1edbi ph\u00e9p nh\u00e2n, chia th\u00ec c\u00e1ch n\u00e0y sai; lu\u00f4n n\u00ean \u0111\u1ed5i v\u1ec1 ph\u00e2n s\u1ed1 tr\u01b0\u1edbc.<\/li>\n<li><strong>Kh\u00f4ng r\u00fat g\u1ecdn k\u1ebft qu\u1ea3:<\/strong> \u0111\u1ec3 k\u1ebft qu\u1ea3 20\/6 m\u00e0 qu\u00ean r\u00fat th\u00e0nh 10\/3 = 3\u2153.<\/li>\n<li><strong>\u0110\u1ed5i ph\u00e2n s\u1ed1 nh\u1ecf h\u01a1n 1 th\u00e0nh h\u1ed7n s\u1ed1:<\/strong> ph\u00e2n s\u1ed1 nh\u01b0 3\/5 kh\u00f4ng th\u1ec3 vi\u1ebft th\u00e0nh h\u1ed7n s\u1ed1 v\u00ec \u0111\u00e3 nh\u1ecf h\u01a1n 1.<\/li>\n<\/ul>\n<h2>\u1ee8ng d\u1ee5ng c\u1ee7a h\u1ed7n s\u1ed1 trong \u0111\u1eddi s\u1ed1ng<\/h2>\n<p>H\u1ed7n s\u1ed1 xu\u1ea5t hi\u1ec7n nhi\u1ec1u trong \u0111\u1eddi s\u1ed1ng h\u1eb1ng ng\u00e0y: \u0111o l\u01b0\u1eddng nguy\u00ean li\u1ec7u n\u1ea5u \u0103n (1\u00bd ch\u00e9n g\u1ea1o), \u0111o chi\u1ec1u d\u00e0i (2\u00be m\u00e9t v\u1ea3i), t\u00ednh th\u1eddi gian (1\u00bd gi\u1edd), hay chia ph\u1ea7n th\u1ee9c \u0103n. C\u00e1ch vi\u1ebft g\u1ed3m s\u1ed1 nguy\u00ean v\u00e0 m\u1ed9t ph\u00e2n s\u1ed1 gi\u00fap ta h\u00ecnh dung nhanh &#8220;bao nhi\u00eau \u0111\u01a1n v\u1ecb tr\u1ecdn v\u1eb9n v\u00e0 c\u00f2n d\u01b0 bao nhi\u00eau&#8221;, tr\u1ef1c quan h\u01a1n so v\u1edbi ph\u00e2n s\u1ed1 3\/2 hay 11\/4. Nh\u1edd v\u1eady h\u1ed7n s\u1ed1 r\u1ea5t ph\u1ed5 bi\u1ebfn trong c\u00f4ng th\u1ee9c n\u1ea5u \u0103n, may \u0111o, x\u00e2y d\u1ef1ng v\u00e0 c\u00e1c ph\u00e9p \u0111o th\u1ef1c t\u1ebf.<\/p>\n<h2>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2>\n<h3>H\u1ed7n s\u1ed1 l\u00e0 g\u00ec?<\/h3>\n<p>H\u1ed7n s\u1ed1 l\u00e0 s\u1ed1 g\u1ed3m ph\u1ea7n nguy\u00ean v\u00e0 ph\u1ea7n ph\u00e2n s\u1ed1 nh\u1ecf h\u01a1n 1, v\u00ed d\u1ee5 2\u00bd \u0111\u1ecdc l\u00e0 hai v\u00e0 m\u1ed9t ph\u1ea7n hai.<\/p>\n<h3>C\u00e1ch chuy\u1ec3n h\u1ed7n s\u1ed1 th\u00e0nh ph\u00e2n s\u1ed1?<\/h3>\n<p>L\u1ea5y ph\u1ea7n nguy\u00ean nh\u00e2n m\u1eabu s\u1ed1 r\u1ed3i c\u1ed9ng t\u1eed s\u1ed1, gi\u1eef nguy\u00ean m\u1eabu: a b\/c = (a\u00d7c + b)\/c.<\/p>\n<h3>C\u00e1ch chuy\u1ec3n ph\u00e2n s\u1ed1 th\u00e0nh h\u1ed7n s\u1ed1?<\/h3>\n<p>L\u1ea5y t\u1eed chia m\u1eabu: th\u01b0\u01a1ng l\u00e0 ph\u1ea7n nguy\u00ean, s\u1ed1 d\u01b0 l\u00e0 t\u1eed m\u1edbi, m\u1eabu s\u1ed1 gi\u1eef nguy\u00ean.<\/p>\n<h3>L\u00e0m ph\u00e9p t\u00ednh c\u1ed9ng tr\u1eeb nh\u00e2n chia v\u1edbi h\u1ed7n s\u1ed1 th\u1ebf n\u00e0o?<\/h3>\n<p>N\u00ean chuy\u1ec3n h\u1ed7n s\u1ed1 v\u1ec1 ph\u00e2n s\u1ed1 r\u1ed3i t\u00ednh, sau \u0111\u00f3 \u0111\u1ed5i k\u1ebft qu\u1ea3 tr\u1edf l\u1ea1i h\u1ed7n s\u1ed1 n\u1ebfu \u0111\u1ec1 y\u00eau c\u1ea7u.<\/p>\n<h3>H\u1ed7n s\u1ed1 3\u00bd b\u1eb1ng ph\u00e2n s\u1ed1 n\u00e0o?<\/h3>\n<p>B\u1eb1ng 7\/2, v\u00ec (3 \u00d7 2 + 1)\/2 = 7\/2.<\/p>\n<h3>Ph\u00e2n s\u1ed1 n\u00e0o chuy\u1ec3n \u0111\u01b0\u1ee3c th\u00e0nh h\u1ed7n s\u1ed1?<\/h3>\n<p>Ch\u1ec9 ph\u00e2n s\u1ed1 l\u1edbn h\u01a1n 1 (t\u1eed s\u1ed1 l\u1edbn h\u01a1n m\u1eabu s\u1ed1) m\u1edbi chuy\u1ec3n \u0111\u01b0\u1ee3c th\u00e0nh h\u1ed7n s\u1ed1.<\/p>\n<p><script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"H\u1ed7n s\u1ed1 l\u00e0 g\u00ec?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"H\u1ed7n s\u1ed1 l\u00e0 s\u1ed1 g\u1ed3m ph\u1ea7n nguy\u00ean v\u00e0 ph\u1ea7n ph\u00e2n s\u1ed1 nh\u1ecf h\u01a1n 1, v\u00ed d\u1ee5 hai v\u00e0 m\u1ed9t ph\u1ea7n hai.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"C\u00e1ch chuy\u1ec3n h\u1ed7n s\u1ed1 th\u00e0nh ph\u00e2n s\u1ed1?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"L\u1ea5y ph\u1ea7n nguy\u00ean nh\u00e2n m\u1eabu s\u1ed1 r\u1ed3i c\u1ed9ng t\u1eed s\u1ed1, gi\u1eef nguy\u00ean m\u1eabu s\u1ed1.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"C\u00e1ch chuy\u1ec3n ph\u00e2n s\u1ed1 th\u00e0nh h\u1ed7n s\u1ed1?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"L\u1ea5y t\u1eed chia m\u1eabu: th\u01b0\u01a1ng l\u00e0 ph\u1ea7n nguy\u00ean, s\u1ed1 d\u01b0 l\u00e0 t\u1eed m\u1edbi, m\u1eabu s\u1ed1 gi\u1eef nguy\u00ean.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"L\u00e0m ph\u00e9p t\u00ednh c\u1ed9ng tr\u1eeb nh\u00e2n chia v\u1edbi h\u1ed7n s\u1ed1 th\u1ebf n\u00e0o?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"N\u00ean chuy\u1ec3n h\u1ed7n s\u1ed1 v\u1ec1 ph\u00e2n s\u1ed1 r\u1ed3i t\u00ednh, sau \u0111\u00f3 \u0111\u1ed5i k\u1ebft qu\u1ea3 tr\u1edf l\u1ea1i h\u1ed7n s\u1ed1 n\u1ebfu \u0111\u1ec1 y\u00eau c\u1ea7u.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"H\u1ed7n s\u1ed1 ba v\u00e0 m\u1ed9t ph\u1ea7n hai b\u1eb1ng ph\u00e2n s\u1ed1 n\u00e0o?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"B\u1eb1ng 7\/2, v\u00ec (3 nh\u00e2n 2 c\u1ed9ng 1) chia 2 = 7\/2.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Ph\u00e2n s\u1ed1 n\u00e0o chuy\u1ec3n \u0111\u01b0\u1ee3c th\u00e0nh h\u1ed7n s\u1ed1?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Ch\u1ec9 ph\u00e2n s\u1ed1 l\u1edbn h\u01a1n 1, t\u1ee9c t\u1eed s\u1ed1 l\u1edbn h\u01a1n m\u1eabu s\u1ed1, m\u1edbi chuy\u1ec3n \u0111\u01b0\u1ee3c th\u00e0nh h\u1ed7n s\u1ed1.\"\n      }\n    }\n  ]\n}\n<\/script><\/p>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p>T\u00f3m l\u1ea1i, <strong>h\u1ed7n s\u1ed1 g\u1ed3m ph\u1ea7n nguy\u00ean v\u00e0 ph\u1ea7n ph\u00e2n s\u1ed1 nh\u1ecf h\u01a1n 1; chuy\u1ec3n sang ph\u00e2n s\u1ed1 theo quy t\u1eafc (a\u00d7c + b)\/c v\u00e0 ng\u01b0\u1ee3c l\u1ea1i b\u1eb1ng ph\u00e9p chia l\u1ea5y d\u01b0<\/strong>. Khi t\u00ednh to\u00e1n, n\u00ean \u0111\u01b0a h\u1ed7n s\u1ed1 v\u1ec1 ph\u00e2n s\u1ed1 \u0111\u1ec3 tr\u00e1nh nh\u1ea7m l\u1eabn, r\u1ed3i \u0111\u1ed5i l\u1ea1i h\u1ed7n s\u1ed1 n\u1ebfu c\u1ea7n. N\u1eafm ch\u1eafc quy t\u1eafc n\u00e0y, b\u1ea1n s\u1ebd l\u00e0m nhanh c\u00e1c b\u00e0i c\u1ed9ng, tr\u1eeb, nh\u00e2n, chia ph\u00e2n s\u1ed1 \u1edf l\u1edbp tr\u00ean.<\/p>\n<p>Xem th\u00eam:<\/p>\n<ul>\n<li><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/nguyen-tu-la-gi\/\">Nguy\u00ean t\u1eed l\u00e0 g\u00ec? C\u1ea5u t\u1ea1o, \u0111\u1eb7c \u0111i\u1ec3m v\u00e0 nguy\u00ean t\u1eed kh\u1ed1i<\/a><\/li>\n<li><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/don-thuc-la-gi\/\">\u0110\u01a1n th\u1ee9c l\u00e0 g\u00ec? \u0110\u01a1n th\u1ee9c thu g\u1ecdn, b\u1eadc v\u00e0 \u0111\u01a1n th\u1ee9c \u0111\u1ed3ng d\u1ea1ng<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>H\u1ed7n s\u1ed1 l\u00e0 s\u1ed1 \u0111\u01b0\u1ee3c vi\u1ebft d\u01b0\u1edbi d\u1ea1ng g\u1ed3m hai ph\u1ea7n: m\u1ed9t ph\u1ea7n nguy\u00ean v\u00e0 m\u1ed9t ph\u1ea7n ph\u00e2n s\u1ed1 nh\u1ecf h\u01a1n 1, v\u00ed d\u1ee5 2\u00bd (\u0111\u1ecdc l\u00e0 hai v\u00e0 m\u1ed9t ph\u1ea7n hai). C\u00e1ch vi\u1ebft n\u00e0y th\u01b0\u1eddng d\u00f9ng \u0111\u1ec3 bi\u1ec3u di\u1ec5n ph\u00e2n s\u1ed1 l\u1edbn h\u01a1n 1 m\u1ed9t c\u00e1ch tr\u1ef1c quan h\u01a1n. \u0110\u00e2y l\u00e0 ki\u1ebfn th\u1ee9c To\u00e1n [&hellip;]<\/p>\n","protected":false},"author":102,"featured_media":570091,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"h\u1ed7n s\u1ed1","_yoast_wpseo_title":"H\u1ed7n s\u1ed1 l\u00e0 g\u00ec? C\u00e1ch chuy\u1ec3n h\u1ed7n s\u1ed1 th\u00e0nh ph\u00e2n s\u1ed1 v\u00e0 b\u00e0i t\u1eadp","_yoast_wpseo_metadesc":"H\u1ed7n s\u1ed1 l\u00e0 g\u00ec? C\u00e1ch chuy\u1ec3n h\u1ed7n s\u1ed1 th\u00e0nh ph\u00e2n s\u1ed1 v\u00e0 ng\u01b0\u1ee3c l\u1ea1i, c\u00e1c ph\u00e9p t\u00ednh v\u00e0 b\u00e0i t\u1eadp c\u00f3 l\u1eddi gi\u1ea3i. Xem chi ti\u1ebft t\u1ea1i Ho\u00e0ng H\u00e0 Mobile.","footnotes":""},"categories":[3910,30453],"tags":[],"class_list":["post-570083","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>H\u1ed7n s\u1ed1 l\u00e0 g\u00ec? C\u00e1ch chuy\u1ec3n h\u1ed7n s\u1ed1 th\u00e0nh ph\u00e2n s\u1ed1 v\u00e0 b\u00e0i t\u1eadp<\/title>\n<meta name=\"description\" content=\"H\u1ed7n s\u1ed1 l\u00e0 g\u00ec? C\u00e1ch chuy\u1ec3n h\u1ed7n s\u1ed1 th\u00e0nh ph\u00e2n s\u1ed1 v\u00e0 ng\u01b0\u1ee3c l\u1ea1i, c\u00e1c ph\u00e9p t\u00ednh v\u00e0 b\u00e0i t\u1eadp c\u00f3 l\u1eddi gi\u1ea3i. 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