\n

L\u00f4 c\u00e2m ch\u00ednh l\u00e0 nh\u1eefng con s\u1ed1 kh\u00f4ng n\u1ed5 trong ng\u00e0y. <\/span>Theo t\u00ean th\u01b0\u1eddng g\u1ecdi m\u00e0 ch\u00fang t\u00f4i ph\u00e2n ra 2 lo\u1ea1i l\u00f4 c\u00e2m: L\u00f4 C\u00e2m \u0110\u1ea7u v\u00e0 L\u00f4 C\u00e2m \u0110u\u00f4i.<\/span>
\nTr\u01b0\u1edbc khi x\u00e1c \u0111\u1ecbnh \u0111\u00e2u l\u00e0 l\u00f4 c\u00e2m th\u00ec c\u00e1c b\u1ea1n c\u1ea7n nh\u1ea5t ph\u1ea3i x\u00e1c \u0111\u1ecbnh \u0111\u00f3 l\u00e0 \u0111\u1ea7u hay \u0111u\u00f4i l\u00f4 c\u1ee7a m\u1ed9t gi\u1ea3i. <\/span>\u0110\u1ec3 d\u1ec5 hi\u1ec3u h\u01a1n, ch\u00fang ta l\u1ea5y v\u00ed d\u1ee5:<\/span>
\nGi\u1ea3i 1 trong b\u1ea3ng k\u1ebft qu\u1ea3 x\u1ed5 s\u1ed1 h\u00f4m nay c\u00f3 03679. Nh\u00ecn v\u00e0o 2 con s\u1ed1 cu\u1ed1i c\u00f9ng l\u00e0 79. L\u00f4 h\u00f4m nay v\u1ec1 79, v\u1eady 7 l\u00e0 \u0111\u1ea7u l\u00f4, 9 l\u00e0 \u0111u\u00f4i (\u0111\u00edt) l\u00f4.<\/span><\/p>\n

C\u00e1ch Soi C\u1ea7u L\u00f4 Tam Gi\u00e1c<\/strong><\/p>\n

T\u00ean th\u01b0\u1eddng g\u1ecdi l\u00e0 Soi c\u1ea7u tam gi\u00e1c v\u00e0 th\u1ef1c ra c\u00f3 kh\u00e1 \u00edt ng\u01b0\u1eddi bi\u1ebft \u0111\u1ebfn. L\u00fd do m\u00e0 \u0111\u01b0\u1ee3c \u00edt ng\u01b0\u1eddi bi\u1ebft \u0111\u1ebfn c\u00f3 l\u1ebd do h\u01a1i thi\u00ean v\u1ec1 \u00e1p d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p v\u1eadt l\u00fd v\u00e0 to\u00e1n h\u1ecdc. \u0110\u00f2i h\u1ecfi s\u1ef1 t\u00ednh to\u00e1n k\u1ef9 l\u01b0\u1ee1ng n\u00ean c\u00f3 r\u1ea5t nhi\u1ec1u ng\u01b0\u1eddi \u201ckh\u00f3 qu\u00e1 b\u1ecf qua\u201d. L\u00e2u d\u1ea7n ph\u01b0\u01a1ng ph\u00e1p n\u00e0y l\u01b0u truy\u1ec1n kh\u00f4ng \u0111\u01b0\u1ee3c r\u1ed9ng r\u00e3i v\u00e0 c\u00f3 ph\u1ea7n b\u1ecb l\u00e3ng qu\u00ean, c\u00f3 ng\u01b0\u1eddi c\u00f2n cho r\u1eb1ng \u0111\u00e2y l\u00e0 ph\u01b0\u01a1ng ph\u00e1p v\u00f4 c\u0103n c\u1ee9. <\/span>
\n<\/span>Nay ch\u00fang t\u00f4i s\u1ebd h\u01b0\u1edbng d\u1eabn s\u01a1 l\u01b0\u1ee3c l\u1ea1i cho c\u00e1c c\u01b0\u1ee3c th\u1ee7 c\u1ee7a ch\u00fang ta tham kh\u1ea3o nh\u00e9. L\u01b0u \u00fd r\u1eb1ng \u0111\u00e2y l\u00e0 ph\u01b0\u01a1ng th\u1ee9c r\u1ea5t kh\u00e1c v\u1edbi ph\u01b0\u01a1ng th\u1ee9c <\/span>Soi C\u1ea7u Pascal <\/span>ch\u00fang t\u00f4i \u0111\u00e3 h\u01b0\u1edbng d\u1eabn \u1edf b\u00e0i tr\u01b0\u1edbc (d\u00f9 c\u0169ng l\u00e0 ph\u01b0\u01a1ng ph\u00e1p h\u00ecnh tam gi\u00e1c. V\u00ec c\u00e1i t\u00ean kh\u00e1 gi\u1ed1ng n\u00ean \u0111\u00f4i khi c\u00f3 s\u1ef1 nh\u1ea7m l\u1eabn.  <\/span>
\n<\/span>\u0110\u1eb7c bi\u1ec7t khi ph\u01b0\u01a1ng ph\u00e1p n\u00e0y k\u1ebft h\u1ee3p v\u1edbi x\u00e1c su\u1ea5t th\u1ed1ng k\u00ea soi \u0111\u1ea7u \u0111\u00edt c\u00e2m th\u00ec to\u00e0n th\u1eafng.<\/span><\/h5>\n

\nL\u01b0u \u00fd<\/strong> : <\/span><\/h5>\n

C\u1ea7n n\u1eafm v\u1eefng c\u00e1ch <\/span>Qu\u1ea3n l\u00fd v\u1ed1n trong l\u00f4 \u0111\u1ec1<\/span>. H\u01a1n n\u1eefa l\u00e0 c\u1ea7n ph\u1ea3i l\u1eadp ra k\u1ebf ho\u1ea1ch ng\u1eafn h\u1ea1n trong v\u00f2ng t\u1eeb 2-3 ng\u00e0y. Nghe qua th\u00ec c\u00f3 v\u1ebb kh\u00e1 gi\u1ed1ng khung nu\u00f4i l\u00f4 nh\u01b0ng s\u1ebd c\u00f3 ch\u1ecdn l\u1ecdc h\u01a1n m\u1ed9t t\u00ed.<\/span>
\n<\/span><\/p>\n

<\/span>Soi c\u1ea7u tam gi\u00e1c<\/strong><\/h3>\n

Ch\u00fang t\u00f4i \u0111\u00e3 v\u1ebd m\u1ed9t h\u00ecnh tam gi\u00e1c \u1edf h\u00ecnh tr\u00ean cho c\u00e1c b\u1ea1n d\u1ec5 h\u00ecnh dung. Ch\u00fang ta c\u00f3 m\u0169i tam gi\u00e1c h\u01b0\u1edbng v\u1ec1 gi\u1ea3i 6 (3 s\u1ed1 257). C\u00f2n ph\u1ea7n \u0111\u00e1y tam gi\u00e1c s\u1ebd t\u00e1ch gi\u1ea3i \u0111\u1eb7c bi\u1ec7t v\u00e0 gi\u1ea3i nh\u1ea5t ra l\u00e0m 2 ph\u1ea7n. 03677 \/ 91142<\/span><\/p>\n

<\/span>Sau \u0111\u00e2y l\u00e0 c\u00e1c b\u01b0\u1edbc t\u00ednh c\u1ee5 th\u1ec3<\/span><\/h4>\n

B\u01b0\u1edbc \u0111\u1ea7u ti\u00ean:<\/b><\/h5>\n

Xem gi\u1ea3i nh\u1ea5t v\u00e0 gi\u1ea3 \u0111\u1eb7c bi\u1ec7t c\u00f3 con s\u1ed1 n\u00e0o kh\u00e1c l\u1ea1 nh\u1ea5t v\u1edbi c\u00e1c s\u1ed1 c\u00f2n l\u1ea1i.<\/span>
\nV\u00ed d\u1ee5: Trong gi\u1ea3i \u0110\u1eb7c Bi\u1ec7t ( 03677 ) c\u00f3:<\/span>
\n+ \u0111u\u00f4i 77 g\u1ed3m 2 s\u1ed1 : B\u1ecf qua<\/span>
\n+ s\u1ed1 gi\u1eefa l\u00e0 0 v\u00e0 6 l\u00e0 s\u1ed1 ch\u1eb5n : B\u1ecf qua<\/span>
\n+ Nh\u1eadn th\u1ea5y s\u1ed1 3 kh\u00e1c bi\u1ec7t nh\u1ea5t trong d\u00e3y s\u1ed1.<\/span>
\nT\u01b0\u01a1ng t\u1ef1, ch\u00fang ta x\u00e9t \u0111\u1ebfn d\u00e3y s\u1ed1 c\u1ee7a gi\u1ea3i Nh\u1ea5t : 91142<\/span>
\n+ c\u1eb7p 11 g\u1ed3m 2 s\u1ed1: B\u1ecf qua<\/span>
\n+ C\u00f3 4 v\u00e0 2 c\u00f9ng ch\u1eb5n (s\u1ed1 ch\u1eb5n) : B\u1ecf qua<\/span>
\n+ Nh\u1eadn th\u1ea5y 9 l\u00e0 s\u1ed1 kh\u00e1c bi\u1ec7t nh\u1ea5t<\/span>
\n=> ch\u00fang ta r\u00fat ra \u0111\u01b0\u1ee3c hai s\u1ed1 : 3 v\u00e0 9 trong 2 d\u00e3y s\u1ed1 c\u1ee7a gi\u1ea3i \u0111\u1eb7c bi\u1ec7t v\u00e0 gi\u1ea3i nh\u1ea5t<\/span><\/p>\n

\nB\u01b0\u1edbc ti\u1ebfp theo:<\/b><\/h5>\n

<\/b>Ch\u1ec9 nh\u00ecn v\u00e0o gi\u1ea3i nh\u00ec v\u00e0 gi\u1ea3i 6, ch\u00fang ta nh\u1eadn th\u1ea5y \u0111\u01b0\u1eddng \u0111i b\u00ean ph\u1ea3i c\u1ee7a h\u00ecnh tam gi\u00e1c (h\u01b0\u1edbng m\u0169i t\u00ean t\u1eeb tr\u00ean xu\u1ed1ng d\u01b0\u1edbi) c\u1eaft hai s\u1ed1 l\u00e0 2 v\u00e0 7.<\/span>
\nNh\u01b0 v\u1eady, ch\u00fang ta c\u00f3 \u0111\u01b0\u1ee3c t\u1ed5ng c\u1ed9ng 4 s\u1ed1 \u0111\u1ec3 l\u1eadp khung nu\u00f4i t\u1eeb 2 \u2013 3 ng\u00e0y<\/span>
\nNh\u1eefng s\u1ed1 ch\u00fang ta \u0111\u00e3 c\u00f3 qua 2 b\u01b0\u1edbc: 3 \u2013 9 \u2013 2 \u2013 7<\/span><\/p>\n

<\/span>X\u00e1c \u0111\u1ecbnh s\u1ed1 theo c\u1ea7u tam gi\u00e1c<\/span><\/h4>\n

Sau khi gh\u00e9p 4 s\u1ed1 tr\u00ean ch\u00fang ta \u0111\u01b0\u1ee3c l\u00f4 khung nh\u01b0 sau:<\/span>
\n37 32 39 23 29 27 79 72 73 93 92 97<\/span>
\nNh\u01b0 v\u1eady, ch\u00fang ta v\u1eeba \u0111\u01b0\u1ee3c m\u1ed9t khung 12 s\u1ed1, \u0111\u1ec3 d\u00e0nh nu\u00f4i trong 2 ng\u00e0y. <\/span>
\nTho\u1ea1t nh\u00ecn s\u1ebd c\u00f3 v\u1ebb l\u00e0 qu\u00e1 nhi\u1ec1u, nh\u01b0ng c\u00e1c b\u1ea1n y\u00ean t\u00e2m. ch\u00fang t\u00f4i s\u1ebd ti\u1ebft l\u1ed9 th\u00eam b\u00ed quy\u1ebft d\u1ed3n v\u1ed1n cho nh\u1eefng con B\u1ea1ch th\u1ee7 n\u00e0y.<\/span>
\n\u0110\u1ec3 ti\u1ebfp n\u1ed1i nh\u1eefng g\u00ec ch\u00fang t\u00f4i \u0111\u00e3 h\u01b0\u1edbng d\u1eabn \u1edf tr\u00ean.<\/span><\/p>\n

\nB\u01b0\u1edbc 1:<\/b><\/h5>\n

C\u00e1c b\u1ea1n c\u1ea7n ph\u1ea3i l\u01b0u t\u00e2m \u0111\u1ebfn nh\u1eefng con l\u00f4 \u0111\u00e3 n\u1ed5 trong ng\u00e0y. d\u1ef1a theo h\u00ecnh tr\u00ean, ch\u00fang ta \u0111\u00e3 c\u00f3 2 l\u00f4 n\u1ed5 (73 v\u00e0 93). Ch\u00fang ta s\u1ebd kh\u00f4ng \u0111\u1ee5ng \u0111\u1ebfn l\u00f4 n\u00e0y trong ng\u00e0y h\u00f4m sau. C\u00f2n l\u1ea1i 10 con l\u00f4 b\u1ea1ch th\u1ee7 \u0111\u00e1nh cho ng\u00e0y 6-1:<\/span>
\n37 32 39 23 29 27 79 72 92 97<\/span><\/p>\n

\nB\u01b0\u1edbc 2:<\/b><\/h5>\n

<\/b>X\u00e9t l\u00f4 c\u00e2m c\u1ee7a ng\u00e0y 5\/1. Ch\u00ednh x\u00e1c th\u00ec ng\u00e0y 5\/1 c\u00f3 m\u1ed9t s\u1ed1 c\u00e2m l\u00e0 7, tr\u00f9ng v\u1edbi l\u00f4 tam gi\u00e1c. Ti\u1ebfp theo, l\u1ea5y s\u1ed1 l\u00f4 c\u00e2m ng\u00e0y 4 (l\u00e0 s\u1ed1 9) k\u1ebft h\u1ee3p th\u00eam v\u00e0o ch\u00fang ta s\u1ebd c\u00f3 con l\u00f4 Song th\u1ee7<\/span><\/p>\n

.<\/span>
\nB\u01b0\u1edbc ti\u1ebfp theo:<\/b><\/h5>\n

<\/b>\u0111\u1ed1i v\u1edbi nh\u1eefng con l\u00f4 c\u00f2n l\u1ea1i, c\u1ea7n nh\u1eadn th\u1ea5y nh\u1eefng con n\u00e0o c\u00f3 s\u1ed1 7 trong d\u00e0n th\u00ec chi m\u1ea1nh v\u1ed1n v\u00e0o. G\u1ed3m 37 27 79 72 97. B\u00ean c\u1ea1nh \u0111\u00f3 c\u0169ng chi m\u1ea1nh v\u00e0o con song th\u1ee7 l\u00f4 79 \u2013 97 v\u1eeba t\u00ednh \u0111\u01b0\u1ee3c \u1edf tr\u00ean.<\/span><\/p>\n

Nh\u01b0 c\u00e1c b\u1ea1n th\u1ea5y, ta d\u1ed3n v\u1ed1n \u0111\u00e3 \u0111\u00fang ch\u1ed7 khi c\u1eb7p song th\u1ee7 l\u00f4 97 \u2013 79 v\u1ec1 t\u1eadn 3 nh\u00e1y. \u0110\u00f3 ch\u00ednh l\u00e0 2 s\u1ed1 c\u00e2m m\u00e0 ch\u00fang ta \u0111\u00e3 t\u00ednh khi k\u1ebft h\u1ee3p v\u1edbi c\u1ea7u l\u00f4 tam gi\u00e1c ph\u00eda tr\u00ean.<\/span>
\n\u0110\u1ed1i v\u1edbi d\u00e0n l\u00f4 c\u00e2m 7 ch\u00fang ta \u0111\u00e3 t\u00ednh ph\u00eda tr\u00ean (37 27 79 72 97) ra t\u1eadn 5 nh\u00e1y v\u00e0 d\u00e0n khung nu\u00f4i ra k\u00e9 1 nh\u00e1y con 32.<\/span>
\nCh\u01b0a d\u1eebng l\u1ea1i \u1edf \u0111\u00f3, c\u00e1c b\u1ea1n h\u00e3y ti\u1ebfp t\u1ee5c l\u1ea5y nh\u1eefng con l\u00f4 ch\u01b0a n\u1ed5 \u0111\u1ec3 nu\u00f4i ti\u1ebfp trong 2 ng\u00e0y ti\u1ebfp theo. Nh\u1eefng con l\u00f4 ch\u01b0a n\u1ed5 bao g\u1ed3m: 37 39 23 29 92 97.<\/span>
\nH\u00e3y c\u00f9ng ch\u00fang t\u00f4i m\u1ed9t l\u1ea7n n\u1eefa l\u1ee5c l\u1ea1i k\u1ebft qu\u1ea3 SXMB \u0111\u1ec3 c\u00f9ng \u0111\u00f3n xem k\u1ebft qu\u1ea3 nh\u00e9! <\/span><\/p>\n

<\/span>C\u00e1ch k\u1ebft h\u1ee3p l\u00f4 c\u00e2m V\u1edbi Soi C\u1ea7u Tam Gi\u00e1c <\/strong><\/h2>\n

Th\u1eddi gian qua ch\u00fang t\u00f4i r\u1ea5t vui v\u00ec c\u00e1c b\u1ea1n \u0111\u1ecdc gi\u1ea3 \u0111\u00e3 tin t\u01b0\u1edfng v\u00e0 g\u1eedi c\u00e2u h\u1ecfi v\u1ec1 cho ch\u00fang t\u00f4i r\u1ea5t nhi\u1ec1u. B\u00e0i vi\u1ebft tr\u01b0\u1edbc ch\u00fang t\u00f4i \u0111\u00e3 h\u01b0\u1edbng d\u1eabn cho c\u00e1c b\u1ea1n c\u00e1ch \u0111\u1ec3 nh\u1eadn bi\u1ebft l\u00f4 c\u00e2m l\u00e0 g\u00ec, soi c\u1ea7u l\u00f4 khan k\u1ebft h\u1ee3p. \u1ede b\u00e0i vi\u1ebft n\u00e0y, ch\u00fang t\u00f4i s\u1ebd l\u1eadp b\u1ea3ng soi c\u1ea7u l\u00f4 v\u00e0 gi\u00fap c\u00e1c b\u1ea1n k\u1ebft h\u1ecdp l\u00f4 c\u00e2m v\u00e0 soi c\u1ea7u tam gi\u00e1c \u0111\u00fang 80-90%. Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y ch\u00fang t\u00f4i \u0111\u00e3 nghi\u00ean c\u1ee9u v\u00e0 \u00e1p d\u1ee5ng th\u1ef1c t\u1ebf \u0111\u00e3 l\u00e2u ng\u00e0y tr\u01b0\u1edbc khi chia s\u1ebb v\u1edbi c\u00e1c b\u1ea1n.<\/span>
\n<\/span><\/p>\n

<\/span>Soi C\u1ea7u L\u00f4 Tam Gi\u00e1c V\u1edbi L\u00f4 C\u00e2m c\u00f3 th\u1eadt s\u1ef1 hi\u1ec7u qu\u1ea3?<\/strong><\/h2>\n

\u0110\u1ea7u ti\u00ean, ch\u00fang ta c\u1ea7n d\u1ef1a v\u00e0o l\u00f4 c\u00e2m \u0111\u1ec3 l\u1ef1a ch\u1ecdn ra \u0111\u01b0\u1ee3c nh\u1eefng con B\u1ea1ch Th\u1ee7 l\u00f4 m\u1ea1nh nh\u1ea5t. Sau \u0111\u00f3 c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng ph\u00e2n b\u1ed5 v\u1ed1n h\u01a1n v\u00e0o ch\u00fang trong 3 ng\u00e0y.<\/span>
\n<\/span>L\u1ecdc l\u1ea5y khung nu\u00f4i 3 ng\u00e0y theo t\u1eebng b\u01b0\u1edbc sau:<\/span><\/p>\n

\n<\/span>B\u01b0\u1edbc 1:<\/b><\/h5>\n

Ta l\u1eadp b\u1ea3ng tam gi\u00e1c ng\u00e0y n\u00e0o th\u00ec l\u1ea5y ba b\u1ea3ng l\u00f4 c\u00e2m trong v\u00f2ng 3 ng\u00e0y t\u00ednh t\u1eeb ng\u00e0y \u0111\u00f3. H\u00f4m n\u00e0o kh\u00f4ng c\u00f3 l\u00f4 c\u00e2m th\u00ec v\u1eabn c\u1ee9 \u0111\u00e1nh d\u1ef1a tr\u00ean 12 s\u1ed1 \u0111\u00e3 s\u00e0ng l\u1ecdc.<\/span>
\n\u0110\u1ec3 cho d\u1ec5 h\u00ecnh dung, ch\u00fang t\u00f4i c\u00f3 v\u00ed d\u1ee5: L\u1eadp b\u1ea3ng tam gi\u00e1c ng\u00e0y 4\/1 n\u00ean x\u00e9t trong 3 ng\u00e0y 4\/1, 5\/1 v\u00e0 6\/1. Ta \u0111\u01b0\u1ee3c 9 \u2013 3 \u2013 4 \u2013 7.<\/span>Trong 4 s\u1ed1 9 \u2013 3 \u2013 4 \u2013 7 n\u00f3i tr\u00ean th\u00ec s\u1ed1 4 kh\u00f4ng thu\u1ed9c trong b\u1ea3ng tam gi\u00e1c ph\u00eda tr\u00ean.<\/span>
\n V\u1eady th\u00ec ch\u1ec9 c\u00f2n s\u1ed1 3 -7 v\u00e0 s\u1ed1 9. Ch\u00fang ta s\u1ebd l\u01b0u \u00fd 3 s\u1ed1 n\u00e0y v\u00e0 t\u1ea1o th\u00e0nh c\u00e1c c\u1eb7p song th\u1ee7 l\u00f4 37 \u2013 73; 39 \u2013 93; 79-97<\/span><\/p>\n<\/div>\n