{"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

D\u1ef1 \u0111o\u00e1n x\u1ed5 s\u1ed1 tr\u00fang th\u01b0\u1edfng quan s\u00e1t<\/h2>\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>\n

\"du

D\u1ef1 \u0111o\u00e1n x\u1ed5 s\u1ed1 tr\u00fang th\u01b0\u1edfng ch\u00ednh x\u00e1c<\/p><\/div>\n

\u0110\u1eb7c bi\u1ec7t ch\u00fa \u00fd trong khi t\u00ednh to\u00e1n<\/h2>\n

\u0110\u1ec1 ng\u00e0y 1 = MN -> suy ra l\u00f4 ng\u00e0y 3 d\u1ef1 \u0111o\u00e1n x\u1ed5 s\u1ed1<\/strong> l\u00e0 AB.<\/p>\n

\u0110\u1ec1 ng\u00e0y 2 l\u00e0 CD. M\u00e0 MN -> CD ( MN suy ra CD t\u01b0\u01a1ng t\u1ef1 nh\u01b0 MN-> AB)<\/p>\n

t\u1ee9c l\u00e0 \u1edf \u0111\u00e2y AB=CD ( k\u1ebft qu\u1ea3 ng\u00e0y 2 = v\u1edbi l\u00f4 d\u1ef1 t\u00ednh ng\u00e0y 3)<\/p>\n

=> Ta s\u1ebd \u0111\u00e1nh BA cho ng\u00e0y t\u1edbi<\/p>\n

\u0110\u1ec1 ng\u00e0y 1 -> l\u00f4 ng\u00e0y 3 l\u00e0 AB. T\u1ed5ng ng\u00e0y 2 = xy -> AB<\/p>\n

=> Ta \u0111\u00e1nh BA<\/p>\n

VD: \u0110\u1ec1 ng\u00e0y 1 = 35 -> l\u00f4 ng\u00e0y 3 = 13. Nh\u01b0ng t\u1ed5ng ng\u00e0y 2 c\u0169ng = 35 -> 13 => suy ra ng\u00e0y  th\u1ee9 3 d\u1ef1 \u0111o\u00e1n x\u1ed5 s\u1ed1 tr\u00fang th\u01b0\u1edfng<\/strong> \u0111\u00e1nh l\u00f4 31<\/p>\n

\u0110\u1ec1 ng\u00e0y 1 = MN -> l\u00f4 d\u1ef1 \u0111o\u00e1n ng\u00e0y 3 = AB. \u0110\u1ec1 ng\u00e0y 2= CD. M\u00e0 C= M+x, D=N+x ( x l\u00e0 s\u1ed1 \u00e2m ho\u1eb7c d\u01b0\u01a1ng)<\/p>\n

=> Ch\u1ed1t \u0111\u00e1nh BA<\/p>\n

Nh\u1eefng c\u00e1ch t\u00ednh to\u00e1n kh\u00f4ng qu\u00e1 ph\u1ee9c t\u1ea1p \u1edf tr\u00ean hi v\u1ecdng s\u1ebd gi\u00fap b\u1ea1n d\u1ef1 \u0111o\u00e1n x\u1ed5 s\u1ed1 ch\u00ednh x\u00e1c<\/strong><\/a>. Th\u1ef1c t\u1eadp th\u1eed nghi\u1ec7m ngay \u0111\u1ec3 ch\u1ed1t s\u1ed1 t\u1ed1i nay.<\/p>\n

\"\"\u00a0soi c\u1ea7u mi\u1ec1n b\u1eafc si\u00eau chu\u1ea9n<\/span>\u00a0\"\"<\/span><\/strong><\/span><\/h3>\n

\"\" d\u1ef1 \u0111o\u00e1n v\u00edp b\u1ea1ch th\u1ee7 l\u00f4 2 nh\u00e1y mb h\u00f4m nay<\/strong><\/a><\/p>\n

\"\" d\u1ef1 \u0111o\u00e1n v\u00edp b\u1ea1ch th\u1ee7 l\u00f4 mb h\u00f4m nay<\/strong><\/a><\/p>\n

\"\" d\u1ef1 \u0111o\u00e1n v\u00edp song th\u1ee7 l\u00f4 mb h\u00f4m nay<\/strong><\/a><\/p>\n

\"\" d\u1ef1 \u0111o\u00e1n v\u00edp b\u1ea1ch th\u1ee7 l\u00f4 k\u00e9p mb h\u00f4m nay<\/strong><\/a><\/p>\n

\"\" d\u1ef1 \u0111o\u00e1n v\u00edp song th\u1ee7 l\u00f4 k\u00e9p mb h\u00f4m nay<\/strong><\/a><\/p>\n

\"\" d\u1ef1 \u0111o\u00e1n v\u00edp b\u1ea1ch th\u1ee7 \u0111\u1ec1 mb h\u00f4m nay<\/strong><\/a><\/p>\n

\"\" d\u1ef1 \u0111o\u00e1n v\u00edp song th\u1ee7 \u0111\u1ec1 mb h\u00f4m nay<\/strong><\/a><\/p>\n

\"\" d\u1ef1 \u0111o\u00e1n v\u00edp d\u00e0n \u0111\u1ec1 4 s\u1ed1 mb h\u00f4m nay<\/strong><\/a><\/p>\n

\"\" d\u1ef1 \u0111o\u00e1n v\u00edp d\u00e0n \u0111\u1ec1 6 s\u1ed1 mb h\u00f4m nay<\/strong><\/a><\/p>\n

\"\" d\u1ef1 \u0111o\u00e1n v\u00edp d\u00e0n \u0111\u1ec1 8 s\u1ed1 mb h\u00f4m nay<\/strong><\/a><\/p>\n

\"\" d\u1ef1 \u0111o\u00e1n v\u00edp d\u00e0n \u0111\u1ec1 10 s\u1ed1 mb h\u00f4m nay<\/strong><\/a><\/p>\n

\"\" d\u1ef1 \u0111o\u00e1n v\u00edp d\u00e0n l\u00f4 4 s\u1ed1 mb h\u00f4m nay<\/strong><\/a><\/p>\n

\"\" d\u1ef1 \u0111o\u00e1n v\u00edp d\u00e0n l\u00f4 6 s\u1ed1 mb h\u00f4m nay<\/strong><\/a><\/p>\n

\"\" d\u1ef1 \u0111o\u00e1n v\u00edp d\u00e0n l\u00f4 8 s\u1ed1 mb h\u00f4m nay<\/strong><\/a><\/p>\n

\"\" d\u1ef1 \u0111o\u00e1n v\u00edp d\u00e0n l\u00f4 xi\u00ean 2 mb h\u00f4m nay<\/strong><\/a><\/p>\n

\"\" d\u1ef1 \u0111o\u00e1n v\u00edp d\u00e0n l\u00f4 xi\u00ean 3 mb h\u00f4m nay<\/strong><\/a><\/p>\n

\"\" d\u1ef1 \u0111o\u00e1n v\u00edp d\u00e0n l\u00f4 xi\u00ean 4 mb h\u00f4m nay<\/strong><\/a><\/p>\n

\"\" d\u1ef1 \u0111o\u00e1n v\u00edp 3 c\u00e0ng mb h\u00f4m nay<\/strong><\/a><\/p>\n

\"\" d\u1ef1 \u0111o\u00e1n v\u00edp d\u00e0n 3 c\u00e0ng 2 s\u1ed1 mb h\u00f4m nay<\/strong><\/a><\/p>\n

\"\" d\u1ef1 \u0111o\u00e1n v\u00edp d\u00e0n l\u00f4 10 s\u1ed1 mb h\u00f4m nay<\/strong><\/a><\/p>\n

\"\" d\u1ef1 \u0111o\u00e1n v\u00edp \u0111\u1ec1 \u0111\u1ea7u \u0111u\u00f4i mb h\u00f4m nay<\/strong><\/a><\/p>\n

\"\"\u00a0soi c\u1ea7u mi\u1ec1n nam si\u00eau chu\u1ea9n<\/span>\u00a0\"\"<\/span><\/strong><\/span><\/h3>\n

\"\" d\u1ef1 \u0111o\u00e1n v\u00edp x\u1ec9u ch\u1ee7 mn h\u00f4m nay<\/strong><\/a><\/p>\n

\"\" d\u1ef1 \u0111o\u00e1n v\u00edp gi\u1ea3i \u0111\u1eb7c bi\u1ec7t mn h\u00f4m nay<\/strong><\/a><\/p>\n

\"\" d\u1ef1 \u0111o\u00e1n v\u00edp gi\u1ea3i 8 mn h\u00f4m nay<\/strong><\/a><\/p>\n

\"\" d\u1ef1 \u0111o\u00e1n v\u00edp bao l\u00f4 mn h\u00f4m nay<\/strong><\/a><\/p>\n

\"\" d\u1ef1 \u0111o\u00e1n v\u00edp c\u1eb7p x\u1ec9u ch\u1ee7 mn h\u00f4m nay<\/strong><\/a><\/p>\n

\"\" d\u1ef1 \u0111o\u00e1n v\u00edp song th\u1ee7 l\u00f4 mn h\u00f4m nay<\/strong><\/a><\/p>\n

\"\" d\u1ef1 \u0111o\u00e1n v\u00edp \u0111\u1ea7u \u0111u\u00f4i gi\u1ea3i 8 mn h\u00f4m nay<\/strong><\/a><\/p>\n

\"\" d\u1ef1 \u0111o\u00e1n v\u00edp \u0111\u1ea7u \u0111u\u00f4i \u0111\u1eb7c bi\u1ec7t mn h\u00f4m nay<\/strong><\/a><\/p>\n

\"\" d\u1ef1 \u0111o\u00e1n v\u00edp l\u00f4 3 s\u1ed1 mn h\u00f4m nay<\/strong><\/a><\/p>\n

\"\"\u00a0soi c\u1ea7u mi\u1ec1n trung si\u00eau chu\u1ea9n<\/span>\u00a0\"\"<\/span><\/strong><\/span><\/h3>\n

\"\" d\u1ef1 \u0111o\u00e1n v\u00edp x\u1ec9u ch\u1ee7 mt h\u00f4m nay<\/strong><\/a><\/p>\n

\"\" d\u1ef1 \u0111o\u00e1n v\u00edp gi\u1ea3i \u0111\u1eb7c bi\u1ec7t mt h\u00f4m nay<\/strong><\/a><\/p>\n

\"\" d\u1ef1 \u0111o\u00e1n v\u00edp gi\u1ea3i 8 mt h\u00f4m nay<\/strong><\/a><\/p>\n

\"\" d\u1ef1 \u0111o\u00e1n v\u00edp bao l\u00f4 mt h\u00f4m nay<\/strong><\/a><\/p>\n

\"\" d\u1ef1 \u0111o\u00e1n v\u00edp c\u1eb7p x\u1ec9u ch\u1ee7 mt h\u00f4m nay<\/strong><\/a><\/p>\n

\"\" d\u1ef1 \u0111o\u00e1n v\u00edp song th\u1ee7 l\u00f4 mt h\u00f4m nay<\/strong><\/a><\/p>\n

\"\" d\u1ef1 \u0111o\u00e1n v\u00edp \u0111\u1ea7u \u0111u\u00f4i gi\u1ea3i 8 mt h\u00f4m nay<\/strong><\/a><\/p>\n

\"\" d\u1ef1 \u0111o\u00e1n v\u00edp \u0111\u1ea7u \u0111u\u00f4i \u0111\u1eb7c bi\u1ec7t mt h\u00f4m nay<\/strong><\/a><\/p>\n

\"\" d\u1ef1 \u0111o\u00e1n v\u00edp l\u00f4 3 s\u1ed1 mt h\u00f4m nay<\/strong><\/a><\/p>\n","protected":false},"excerpt":{"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 \u0111\u1ec3 t\u0103ng th\u00eam c\u01a1 h\u1ed9i chi\u1ebfn th\u1eafng…. Read more »<\/a><\/p>\n","protected":false},"author":7,"featured_media":16847,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[372,371],"tags":[37,38,32,36],"yoast_head":"\nD\u1ef1 \u0111o\u00e1n x\u1ed5 s\u1ed1 tr\u00fang th\u01b0\u1edfng c\u1ef1c chu\u1ea9n x\u00e1c<\/title>\n<meta name=\"description\" content=\"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. 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