9 c\u00e1ch soi c\u1ea7u mi\u1ec1n trung c\u00f3 x\u00e1c su\u1ea5t tr\u00fang l\u1edbn<\/figcaption><\/figure>\n3. Soi c\u1ea7u mi\u1ec1n trung theo c\u1ea7u ch\u1ea1m s\u1ed1 3<\/h2>\n
L\u1ea5y t\u1ed5ng gi\u1ea3i \u0110B ng\u00e0y CN tu\u1ea7n n l\u00e0m b\u1ed9 \u0111\u1ec1 \u0111\u00e1nh \u0111\u1ebfn h\u1ebft tu\u1ea7n \u0111\u00f3.
\nC\u1ea7u n\u00e0y \u0103n 3-5 tu\u1ea7n r\u1ed3i ngh\u1ec9 2-3 tu\u1ea7n r\u1ed3i m\u00fac t\u00edp.
\nC\u1ea7u n\u00e0y r\u1ea5t d\u1ec5 \u0111\u00e1nh, c\u1ee9 o\u00e1nh th\u1eb3ng t\u1ed5ng c\u1ee7a gi\u1ea3i \u0110B ho\u1eb7c o\u00e1nh b\u00f3ng 1 s\u1ed1 l\u00e0 \u0111\u1edbp li\u1ec1n.
\nV\u00ed d\u1ee5:
\nCN-31\/8-gi\u1ea3i \u0110B: 50483 = t\u1ed5ng 20 ==> ng\u00e0y 02\/9 n\u1ed5 25
\nCN-07\/9-gi\u1ea3i \u0110B: 25511 = t\u1ed5ng 14 ==> ng\u00e0y 10\/9 n\u1ed5 14
\nCN-14\/9-gi\u1ea3i \u0110B: 07439 = t\u1ed5ng 23 ==> ng\u00e0y 15\/9 n\u1ed5 32<\/p>\n
CN-21\/9-gi\u1ea3i \u0110B: 63727 = t\u1ed5ng 25 ==> Ch\u00fa \u00fd c\u00f3 th\u1ec3 \u0111\u1ec1 v\u1ec1 020, 252, 575
\n( Tu\u1ea7n t\u1eeb 22\/9 \u0111\u1ebfn 28\/9 c\u00f3 th\u1ec3 \u0111\u1ec1 v\u1ec1 020, 252, 575 )<\/p>\n
4. Soi c\u1ea7u mi\u1ec1n trung theo c\u1ea7u ch\u1ea1m s\u1ed1 4<\/h2>\n
L\u1ea5y 2 s\u1ed1 \u0111\u1ea7u ti\u00ean c\u1ee7a gi\u1ea3i nh\u1ea5t ng\u00e0y th\u1ee9 2 tu\u1ea7n n l\u00e0m b\u1ed9 s\u1ed1 \u0111\u00e1nh \u0111\u1ebfn th\u1ee9 2 tu\u1ea7n n+1.
\nC\u1ea7u n\u00e0y \u0103n r\u1ea5t \u0111\u1ec1u, c\u1ee9 \u0103n 4-7 tu\u1ea7n th\u00ec ngh\u1ec9 1-2 tu\u1ea7n r\u1ed3i \u0103n ti\u1ebfp. V\u00ec v\u1eady khi th\u1ea5y hi\u1ec7n t\u01b0\u1ee3ng b\u1eaft c\u1ea7u th\u00ec fang.
\nV\u00ed d\u1ee5:<\/p>\n
Th\u1ee9 2-01\/9 c\u00f3 gi\u1ea3i nh\u1ea5t 32203 –> l\u1ea5y 32 l\u00e0m b\u1ed9 \u0111\u1ec1 ==> 5\/9 n\u1ed5 78<\/p>\n
Th\u1ee9 2-08\/9 c\u00f3 gi\u1ea3i nh\u1ea5t 87873 –> l\u1ea5y 78 l\u00e0m b\u1ed9 \u0111\u1ec1 ==> 15\/9 n\u1ed5 32<\/p>\n
Th\u1ee9 2-15\/9 c\u00f3 gi\u1ea3i nh\u1ea5t 15381 –> l\u1ea5y 15 l\u00e0m b\u1ed9 \u0111\u1ec1 ==> 17\/9 n\u1ed5 06, ng\u00e0y 20\/9 n\u1ed5 01<\/p>\n
Th\u1ee9 2-22\/9 c\u00f3 gi\u1ea3i nh\u1ea5t 27444 –> l\u1ea5y 27 l\u00e0m b\u1ed9 \u0111\u1ec1 ==> C\u00f3 th\u1ec3 \u0111\u1ec1 v\u1ec1 k\u00e9p 22, 77, 272
\n( Tu\u1ea7n t\u1eeb 23\/9 \u0111\u1ebfn 29\/9 c\u00f3 th\u1ec3 \u0111\u1ec1 v\u1ec1 k\u00e9p 22, 77, 272 – ch\u00fa \u00fd ch\u00fa \u00fd )<\/p>\n
5. Soi c\u1ea7u mi\u1ec1n trung theo gi\u1ea3i 7 kqxs<\/h2>\n
a, l\u1ea5y 2 s\u1ed1 gi\u1ea3i 7 cu\u1ed1i c\u00f9ng l\u00e0m s\u1ed1 ch\u1ea1m c\u1ea7u.<\/p>\n
– \u0102n li\u1ec1n ng\u00e0y; th\u00f4ng th\u01b0\u1eddng 2-4 ng\u00e0y li\u1ec1n
\nV\u00ed d\u1ee5: 3 ng\u00e0y 18, 19, 20\/9 \u0111\u1ec1u l\u1ea5y 1 s\u1ed1 cu\u1ed1i gi\u1ea3i 7.
\n– \u0102n c\u00e1ch ng\u00e0y th\u00ec c\u1ea7u d\u00e0i h\u01a1n 5-8 ng\u00e0y (ho\u1eb7c ch\u1ec9 \u0103n v\u00e0o ng\u00e0y ch\u1eb5n, ho\u1eb7c ch\u1ec9 v\u00e0o ng\u00e0y l\u1ebb)
\nV\u00ed d\u1ee5:
\n18\/8-gi\u1ea3i 7 l\u00e0 31 –> \u0111\u1ec1 19\/8 n\u1ed5 38
\n20\/8-gi\u1ea3i 7 l\u00e0 82 –> \u0111\u1ec1 21\/8 n\u1ed5 27
\n22\/8-gi\u1ea3i 7 l\u00e0 90 –> \u0111\u1ec1 23\/8 n\u1ed5 20
\n…….t\u01b0\u01a1ng t\u1ef1 c\u00e1c ng\u00e0y sau c\u0169ng th\u1ebf.<\/p>\n
b, l\u1ea5y 3 gi\u1ea3i 7 \u1edf tr\u00ean:
\nCh\u1ea1m c\u1ea7u n\u00e0y th\u00ec ng\u00e0y n\u00e0o c\u0169ng ch\u1ea1m \u00edt nh\u1ea5t 1 s\u1ed1.
\nKh\u00f4ng c\u1ea7n v\u00ed d\u1ee5 AE c\u1ee9 Test l\u1ea1i l\u1ecbch s\u1eed l\u00f4 \u0111\u1ec1 m\u00e0 xem.<\/p>\n
6. Soi c\u1ea7u mi\u1ec1n trung d\u1ef1a v\u00e0o L\u00f4 B\u1ea1ch Th\u1ee7<\/h2>\n
– Soi b\u1ea3ng k\u1ebft qu\u1ea3 n\u1ebfu th\u1ea5y \u1edf 3 gi\u1ea3i li\u1ec1n nhau c\u00f3 2 s\u1ed1 A-B x\u1ebfp theo h\u00ecnh qu\u1ea3 tr\u00e1m th\u1ebf n\u00e0y:
\nB
\nA B A
\nB
\nth\u00ec qu\u1ea5t lu\u00f4n c\u1ea3 th\u1ed5 c\u01b0 lu\u00f4n con l\u00f4 b\u1ea1ch th\u1ee7 BA trong 2 ng\u00e0y sau \u0111\u00f3.
\nV\u00ed d\u1ee5:
\nNg\u00e0y 26\/8\/2008, t\u1ea1i gi\u1ea3i 3 c\u00f3 hi\u1ec7n t\u01b0\u1ee3ng nh\u01b0 sau:
\n65540
\n72524
\n32573 ===> Ng\u00e0y 27\/9 n\u1ed5 l\u00f4 52 hai nh\u00e1y.<\/p>\n
Ng\u00e0y 03\/06\/2011, T\u1ea1i gi\u1ea3i 5,6,7 c\u00f3 hi\u1ec7n t\u01b0\u1ee3ng nh\u01b0 sau:<\/p>\n
42<\/p>\n
929<\/p>\n
9210 = = =>2=B,9=A. = => BA = => 29. C\u00f3 x\u1ea3y ra ng\u00e0y 04 ho\u1eb7c 5 th\u00e1ng 06?<\/p>\n
Ng\u00e0y 31\/8\/08, t\u1ea1i gi\u1ea3i 4-5 c\u00f3 hi\u1ec7n t\u01b0\u1ee3ng:<\/p>\n
6293
\n3230
\n0203 ===> Ng\u00e0y 02\/9 n\u1ed5 lu\u00f4n l\u00f4 23 hai nh\u00e1y<\/p>\n
Hi\u1ec7n t\u01b0\u1ee3ng n\u00e0y r\u1ea5t \u00edt g\u1eb7p khi g\u1eb7p ch\u1eafc ch\u1eafn \u0103n.<\/p>\n
7. C\u00e1ch soi c\u1ea7u mi\u1ec1n trung theo \u0111\u1ec1 d\u00e0n trong tu\u1ea7n<\/h2>\n8. Soi c\u1ea7u mi\u1ec1n trung d\u1ef1a theo ch\u1ea1m \u0111\u1ec1 s\u1ed1 9<\/h2>\n9. Soi c\u1ea7u mi\u1ec1n trung b\u1eb1ng c\u00e1ch c\u1ea7u ch\u1ea1m \u0111\u1ec1 s\u1ed1 11<\/h2>\n
Tr\u00ean \u0111\u00e2y l\u00e0 9 c\u00e1ch soi c\u1ea7u mi\u1ec1n trung<\/strong> \u0111\u01b0\u1ee3c anh em s\u1eed d\u1ee5ng nhi\u1ec1u nh\u1ea5t t\u1eeb x\u01b0a t\u1edbi nay. M\u1ed7i ph\u01b0\u01a1ng ph\u00e1p s\u1ebd c\u00f3 nh\u1eefng \u01b0u nh\u01b0\u1ee3c \u0111i\u1ec3m nh\u1ea5t \u0111\u1ecbnh. Anh em c\u00e2n nh\u1eafc k\u1ef9 l\u01b0\u1ee1ng tr\u01b0\u1edbc khi ch\u01a1i.<\/p>\nCh\u00fac th\u00e0nh c\u00f4ng!<\/p>\n