{"id":16846,"date":"2024-03-25T06:40:49","date_gmt":"2024-03-25T06:40:49","guid":{"rendered":"http:\/\/dudoansode.com\/?p=16846"},"modified":"2024-03-25T06:40:49","modified_gmt":"2024-03-25T06:40:49","slug":"du-doan-xo-trung-thuong-2","status":"publish","type":"post","link":"https:\/\/bacangmienbac.com.\/du-doan-xo-trung-thuong-2\/","title":{"rendered":"D\u1ef1 \u0111o\u00e1n x\u1ed5 s\u1ed1 tr\u00fang th\u01b0\u1edfng c\u1ef1c chu\u1ea9n x\u00e1c"},"content":{"rendered":"
Ch\u01a1i x\u1ed5 s\u1ed1 kh\u00f4ng ph\u1ea3i l\u00e0 vi\u1ec7c \u0111\u01a1n gi\u1ea3n ch\u1ec9 d\u1ef1a v\u00e0o may m\u1eafn. B\u1edfi v\u1eady c\u1ea7n d\u1ef1 \u0111o\u00e1n x\u1ed5 s\u1ed1 tr\u00fang th\u01b0\u1edfng<\/strong> \u0111\u1ec3 t\u0103ng th\u00eam c\u01a1 h\u1ed9i chi\u1ebfn th\u1eafng. C\u00f9ng t\u00ecm hi\u1ec3u ngay c\u00e1ch d\u1ef1 \u0111o\u00e1n d\u01b0\u1edbi \u0111\u00e2y \u0111\u1ec3 mang t\u00e0i l\u1ed9c v\u1ec1 nh\u00e0 n\u00e0o.<\/p>\n \u0110\u1ec3 soi c\u1ea7u l\u00f4 \u0111\u1ec1 h\u00f4m nay<\/strong>, ta x\u00e9t k\u1ebft qu\u1ea3 trong 2 h\u00f4m tr\u01b0\u1edbc. Gi\u1ea3 s\u1eed ng\u00e0y th\u1ee9 nh\u1ea5t c\u00f3 2 s\u1ed1 cu\u1ed1i l\u00e0 58 -> suy ra ng\u00e0y th\u1ee9 3 s\u1ebd c\u00f3 36 ( v\u00ec 5->3 ; 6 )<\/p>\n VD c\u1ee5 th\u1ec3 : H\u00f4m nay \u0110\u1ec1 v\u1ec1 32 -> suy ra ng\u00e0y kia s\u1ebd c\u00f3 l\u00f4 15 ( v\u00ec 3->1 ; 2->5)<\/p>\n Tuy nhi\u00ean, c\u00e1ch t\u00ednh n\u00e0y ch\u1ec9 ch\u00ednh x\u00e1c v\u1edbi c\u00e1c gi\u1ea3i \u0111\u1eb7c bi\u1ec7t ng\u00e0y th\u1ee9 Nh\u1ea5t c\u00f3 t\u1ed5ng t\u1eeb 20 -> 30.<\/p>\n Quy \u0111\u1ecbnh \u0111\u1ec3 ti\u1ec7n cho vi\u1ec7c tr\u00ecnh b\u00e0y t\u00ednh to\u00e1n d\u1ef1 \u0111o\u00e1n x\u1ed5 s\u1ed1 tr\u00fang th\u01b0\u1edfng<\/strong>:<\/p>\n MN = \u0110\u1ec1 ng\u00e0y 1<\/p>\n CD = \u0110\u1ec1 ng\u00e0y 2<\/p>\n AB = L\u00f4 ng\u00e0y 3 (c\u00f3 th\u1ec3 d\u1ef1 \u0111o\u00e1n \u0111\u01b0\u1ee3c)<\/p>\n A, B l\u00e0 kh\u00e1c nhau n\u1ebfu trong c\u00f9ng m\u1ed9t s\u1ed1. C\u00f2n \u1edf 2 ng\u00e0y kh\u00e1c nhau th\u00ec c\u00f3 th\u1ec3 gi\u1ed1ng nhau.<\/p>\n VD: MN = 35 ( 3#5) CD = 39 ( 3#9, C=M)<\/p>\n C\u1ea7n nh\u1edb: \u1edf \u0111\u00e2y, CD ch\u01b0a c\u00f3 quan h\u1ec7 g\u00ec v\u1edbi nhau.<\/p>\n Trong t\u1eebng ng\u00e0y c\u1ee5 th\u1ec3 ta c\u00f3:<\/p>\n T\u1ed5ng gi\u1ea3i \u0111\u1eb7c bi\u1ec7t = 20 ; 25<\/p>\n Ng\u00e0y 1 c\u00f3 \u0110\u1ec1 = MN -> suy ra l\u00f4 ng\u00e0y ba = AB => Ta \u0111\u00e1nh BA<\/p>\n T\u1ed5ng \u0111\u1eb7c bi\u1ec7t = s\u1ed1 ch\u1eb5n ( 22, 24, 26, 28)<\/p>\n Ng\u00e0y 1 \u0111\u1ec1 = MN -> ta d\u1ef1 \u0111o\u00e1n L\u00f4 ng\u00e0y 3 = AB<\/p>\n Ta l\u1ea5y 10 \u2013 B = I v\u00e0 gi\u1eef nguy\u00ean A => cu\u1ed1i c\u00f9ng ta \u0111\u00e1nh AI<\/p>\n T\u1ed5ng b\u1eb1ng s\u1ed1 l\u1ebb v\u00e0 30 (21, 23, 29, 30)<\/p>\n Ng\u00e0y 1 \u0111\u1ec3 = MN -> d\u1ef1 \u0111o\u00e1n l\u00f4 \u0111\u1ec1<\/strong> ng\u00e0y ba = AB => v\u00e0 \u0111\u00e1nh AB<\/p>\nD\u1ef1 \u0111o\u00e1n x\u1ed5 s\u1ed1 tr\u00fang th\u01b0\u1edfng quan s\u00e1t<\/h2>\n