L\u00f4 \u0111\u1ec1 \u0111\u1ea7u \u0111u\u00f4i l\u00e0 m\u1ed9t trong nh\u1eefng c\u00e1ch ch\u01a1i \u0111\u01b0\u1ee3c nhi\u1ec1u ng\u01b0\u1eddi l\u1ef1a ch\u1ecdn tham gia. C\u00e1ch \u0111\u00e1nh \u0111\u1ec1 n\u00e0y mang \u0111\u1ebfn t\u1ef7 l\u1ec7 \u0103n cao, \u0111\u1eb7c bi\u1ec7t l\u00e0 c\u00e1c quy t\u1eafc khi ch\u01a1i kh\u00f4ng qu\u00e1 ph\u1ee9c t\u1ea1p. N\u00ean c\u00e1c b\u1ea1n c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng tham gia b\u1ea5t k\u1ef3 l\u00fac n\u00e0o. \u0110\u00ea c\u00f3 <\/span>c\u00e1ch \u0111\u00e1nh s\u1ed1 \u0111\u1ec1 \u0111\u1ea7u \u0111u\u00f4i<\/b> hi\u1ec7u qu\u1ea3 nh\u1ea5t c\u00e1c b\u1ea1n h\u00e3y theo d\u00f5i b\u00e0i vi\u1ebft d\u01b0\u1edbi \u0111\u00e2y nh\u00e9. <\/span><\/p>\n S\u1ed1 \u0111\u1ec1 bao g\u1ed3m t\u1ea5t c\u1ea3 c\u00e1c con s\u1ed1 h\u00e0ng \u0111\u01a1n v\u1ecb trong d\u00e3y s\u1ed1 t\u1ef1 nhi\u00ean t\u1eeb 0-9. T\u1ef7 l\u1ec7 \u0103n c\u1ee7a s\u1ed1 \u0111\u1ec1 l\u00e0 1\/10, t\u01b0\u01a1ng \u1ee9ng v\u1edbi 10% \u0111\u1ed1i v\u1edbi \u0111u\u00f4i ho\u1eb7c \u0111\u1ea7u \u0111\u1ec1. Ng\u01b0\u1eddi ch\u01a1i s\u1ebd d\u1ef1a v\u00e0o k\u1ebft qu\u1ea3 x\u1ed5 s\u1ed1 \u0111\u1eb7c bi\u1ec7t c\u1ee7a ng\u00e0y h\u00f4m nay \u0111\u1ec3 t\u00ednh cho nh\u1eefng ng\u00e0y sau n\u00e0y. \u0110i\u1ec1u n\u00e0y mang \u0111\u1ebfn kh\u1ea3 n\u0103ng chi\u1ebfn th\u1eafng cao v\u00e0 an to\u00e0n cho ng\u01b0\u1eddi ch\u01a1i. <\/span><\/p>\n V\u00ed d\u1ee5: H\u00f4m qua gi\u1ea3i \u0111\u1eb7c bi\u1ec7t l\u00e0 97668, c\u00f3 t\u1ed5ng l\u00e0 36=9. T\u1eeb \u0111\u00f3, ta c\u00f3 ch\u1ea1m \u0111\u1ea7u l\u00e0 1, 2, 3, 4, 5, 6, 7, 8, 9 v\u00e0 ch\u1ea1m \u0111u\u00f4i l\u00e0 9, 8, 7, 6, 5, 4, 3, 2, 1. H\u00f4m nay, s\u1ed1 \u0111\u1ec1 s\u1ebd l\u00e0 05119, \u0111\u1ea7u 0 \u0111\u00edt 9. T\u1ed5ng l\u00e0 16=7. Nh\u01b0 v\u1eady, ch\u1ea1m \u0111\u1ea7u c\u1ee7a ng\u00e0y h\u00f4m sau s\u1ebd l\u00e0 1, 2, 3, 4, 5, 6, 7.<\/span><\/p>\n\u0110\u00e1nh s\u1ed1 \u0111\u1ec1 \u0111\u1ea7u \u0111u\u00f4i theo s\u1ed1 \u0111\u1ec1<\/b><\/h2>\n