{"id":18512,"date":"2024-05-15T02:25:01","date_gmt":"2024-05-15T02:25:01","guid":{"rendered":"https:\/\/soicau2012.minhngocxoso.com\/?p=18512"},"modified":"2024-05-15T02:25:01","modified_gmt":"2024-05-15T02:25:01","slug":"mot-so-phuong-phap-soi-tong-de","status":"publish","type":"post","link":"https:\/\/ancau3mien.com\/mot-so-phuong-phap-soi-tong-de\/","title":{"rendered":"m\u1ed9t s\u1ed1 ph\u01b0\u01a1ng ph\u00e1p soi t\u1ed5ng \u0111\u1ec1"},"content":{"rendered":"

\"\"<\/h2>\n

Soi c\u1ea7u t\u1ed5ng \u0111\u1ec1 c\u1ea3 n\u0103m theo tam gi\u00e1c Pascal<\/h2>\n

Ng\u01b0\u1eddi ch\u01a1i n\u00ean ph\u00e2n bi\u1ec7t r\u00f5 r\u00e0ng \u0111\u1ec3 kh\u00f4ng nh\u1ea7m l\u1eabn v\u1edbi c\u00e1ch soi c\u1ea7u h\u00ecnh tam gi\u00e1c. S\u1eed d\u1ee5ng t\u1ed5ng Pascal c\u1ee7a Newton ch\u00ednh l\u00e0 \u1ee9ng d\u1ee5ng tuy\u1ec7t v\u1eddi gi\u00fap ng\u01b0\u1eddi ch\u01a1i nghi\u00ean c\u1ee9u l\u00f4 \u0111\u1ec1 kh\u00e1 chu\u1ea9n. Ch\u1ec9 c\u1ea7n b\u1ea1n \u00e1p d\u1ee5ng chu\u1ea9n c\u00e1ch \u0111\u00e1nh l\u00f4 gan, ki\u1ebfn th\u1ee9c to\u00e1n h\u1ecdc, \u0111\u1ed9 may m\u1eafn, kinh nghi\u1ec7m b\u1ea3n th\u00e2n \u0111\u1ec3 \u0103n \u0111\u01b0\u1ee3c con l\u00f4 th\u01a1m.<\/p>\n

\u0110\u1ea7u ti\u00ean, ng\u01b0\u1eddi ch\u01a1i ch\u1ecdn k\u1ebft qu\u1ea3 c\u1ee7a gi\u1ea3i nh\u1ea5t v\u00e0 gi\u1ea3i \u0111\u1eb7c bi\u1ec7t c\u1ee7a x\u1ed5 s\u1ed1 h\u00f4m qua. Sau \u0111\u00f3, b\u1ea1n vi\u1ebft th\u00e0nh m\u1ed9t h\u00e0ng n\u1eb1m t\u1ea1i ph\u00eda d\u01b0\u1edbi \u0111\u00e1y tam gi\u00e1c. Gi\u1ea3 d\u1ee5 k\u1ebft qu\u1ea3 gi\u1ea3i nh\u1ea5t v\u1ec1 75178, c\u00f2n gi\u1ea3i \u0111\u1eb7c bi\u1ec7t 15315. Ng\u01b0\u1eddi ch\u01a1i gh\u00e9p s\u1ed1 \u1edf trong hai gi\u1ea3i n\u00e0y th\u00e0nh d\u00e3y s\u1ed1 1 5 3 1 5 7 5 1 7 8. Khi \u0111\u01b0\u1ee3c d\u00e3y n\u1eb1m d\u01b0\u1edbi c\u1ee7a \u0111\u00e1y tam gi\u00e1c, ng\u01b0\u1eddi ch\u01a1i \u00e1p d\u1ee5ng theo Pascal c\u1ee7a Newton \u0111\u1ec3 x\u00e2y d\u1ef1ng tam gi\u00e1c.<\/p>\n

Ng\u01b0\u1eddi ch\u01a1i th\u1ef1c hi\u1ec7n c\u1ed9ng hai s\u1ed1 t\u1eeb tr\u00e1i qua ph\u1ea3i v\u1edbi nhau \u0111\u1ec3 \u0111\u01b0\u1ee3c d\u00e3y s\u1ed1 m\u1edbi. Ti\u1ebfp theo, \u0111i\u1ec1n l\u00ean h\u00e0ng th\u1ee9 hai. C\u1ee5 th\u1ec3 c\u1ed9ng c\u00e1c con s\u1ed1 1 + 5, 5 + 3, 3 + 1, 1 + 5\u2026 c\u1ee9 nh\u01b0 v\u1eady \u0111\u1ebfn h\u1ebft. Ta \u0111\u01b0\u1ee3c h\u00e0ng 2 \u0111\u00f3 l\u00e0 6 8 4 6 2 2 6 8 5. B\u1ea1n th\u1ef1c hi\u1ec7n nh\u01b0 v\u1eady th\u00e0nh h\u00ecnh tam gi\u00e1c Pascal \u0111\u1ebfn khi t\u00ecm \u0111\u01b0\u1ee3c hai con s\u1ed1 cu\u1ed1i c\u00f9ng. Con s\u1ed1 sau qu\u00e1 tr\u00ecnh c\u1ed9ng l\u00e0 89, nu\u00f4i ngay con s\u1ed1 b\u1ea1ch th\u1ee7 98 \u2013 89 t\u00f9y \u00fd.<\/p>\n

B\u1eaft t\u1ed5ng \u0111\u1ec1 d\u1ef1a v\u00e0o ng\u00e0y b\u00ed truy\u1ec1n<\/h2>\n

\u0110\u00e2y l\u00e0 ph\u01b0\u01a1ng ph\u00e1p b\u1eaft t\u1ed5ng qua gi\u1ea3i \u0111\u1eb7c bi\u1ec7t, d\u1ef1a ch\u1ee7 y\u1ebfu theo c\u00f4ng th\u1ee9c to\u00e1n h\u1ecdc. Sau th\u1eddi gian nghi\u00ean c\u1ee9u, chuy\u00ean gia c\u1ee7a 188xoso r\u00fat ra c\u00f4ng th\u1ee9 kh\u00e1 hi\u1ec7u qu\u1ea3. Ng\u01b0\u1eddi ch\u01a1i s\u1ebd l\u1ea5y hai gi\u1ea3i \u0111\u1eb7c bi\u1ec7t 2 ng\u00e0y li\u00ean ti\u1ebfp \u0111\u1ec3 t\u00ednh. C\u00f4ng th\u1ee9c th\u1ef1c hi\u1ec7n nh\u01b0 sau:<\/p>\n