L\u00f4 k\u00e9p l\u00e0 g\u00ec?<\/strong> C\u00e1ch ph\u00e2n bi\u1ec7t k\u00e9p b\u1eb1ng, \u0111\u1ec1 k\u00e9p l\u1ec7ch, k\u00e9p \u00e2m, s\u00e1t k\u00e9p<\/strong> nh\u01b0 th\u1ebf n\u00e0o? T\u1ea5t c\u1ea3 nh\u1eefng th\u00f4ng tin m\u00e0 anh em c\u1ea7n \u0111\u1ec3 soi c\u1ea7u chu\u1ea9n s\u1ebd \u0111\u01b0\u1ee3c t\u00f4i chia s\u1ebb ngay d\u01b0\u1edbi \u0111\u00e2y.H\u00e3y c\u00f9ng\u00a0ki\u1ec3m tra xem m\u00ecnh hi\u1ec3u bi\u1ebft \u0111\u01b0\u1ee3c bao nhi\u00eau v\u1ec1 c\u00e1c d\u1ea1ng \u0111\u00e1nh l\u00f4 k\u00e9p<\/strong><\/span> n\u00e0y nh\u00e9.<\/p>\n\n\nT\u00f3m t\u1eaft n\u1ed9i dung:<\/p>\n<\/div>\n\n\nB\u1ed9 \u0111\u1ec1 k\u00e9p l\u1ec7ch l\u00e0 g\u00ec?\n\nK\u00e9p l\u1ec7ch g\u1ed3m nh\u1eefng con n\u00e0o v\u1eady?<\/li>\n<\/ul>\n<\/li>\nKh\u00e1i ni\u1ec7m v\u1ec1 k\u00e9p b\u1eb1ng<\/li>\n\u0110\u1ec1 s\u00e1t k\u00e9p l\u00e0 sao?\n\na) B\u1ed9 s\u00e1t k\u00e9p l\u1ec7ch<\/li>\nb) S\u00e1t k\u00e9p b\u1eb1ng<\/li>\n<\/ul>\n<\/li>\n\u0110\u1ecbnh ngh\u0129a k\u00e9p \u00e2m<\/li>\nL\u1eddi k\u1ebft<\/li>\n<\/ul>\n<\/nav>\n<\/div>\n<\/span>B\u1ed9 \u0111\u1ec1 k\u00e9p l\u1ec7ch l\u00e0 g\u00ec?<\/h2>\nK\u00e9p l\u1ec7ch<\/strong> hay \u0111\u1ec1 k\u00e9p l\u1ec7ch<\/strong> \u0111\u01b0\u1ee3c hi\u1ec3u l\u00e0 c\u00e1ch b\u1eaft l\u00f4 c\u00f3 ch\u1eef s\u1ed1 h\u00e0ng ch\u1ee5c v\u00e0 h\u00e0ng \u0111\u01a1n v\u1ecb l\u00e0 b\u00f3ng d\u01b0\u01a1ng c\u1ee7a nhau.<\/p>\nN\u1ebfu ch\u01b0a bi\u1ebft b\u00f3ng d\u01b0\u01a1ng l\u00e0 g\u00ec th\u00ec \u0111\u1ec3 t\u00f4i nh\u1eafc l\u1ea1i nh\u00e9, c\u1ee5 th\u1ec3:<\/p>\n\n0<\/strong> b\u00f3ng d\u01b0\u01a1ng l\u00e0 5<\/strong>.<\/li>\n1<\/strong> c\u00f3 b\u00f3ng d\u01b0\u01a1ng l\u00e0 6<\/strong>.<\/li>\n2<\/strong> \u1ee9ng v\u1edbi b\u00f3ng d\u01b0\u01a1ng l\u00e0 7.<\/strong><\/li>\n3<\/strong> t\u01b0\u01a1ng \u1ee9ng b\u00f3ng d\u01b0\u01a1ng l\u00e0 8<\/strong>.<\/li>\n4<\/strong> c\u00f3 c\u1eb7p b\u00f3ng d\u01b0\u01a1ng l\u00e0 9<\/strong>.<\/li>\n<\/ul>\n<\/span>K\u00e9p l\u1ec7ch g\u1ed3m nh\u1eefng con n\u00e0o v\u1eady?<\/h3>\nTrong 100 s\u1ed1 \u0111\u1ec1 th\u00ec k\u00e9p l\u1ec7ch g\u1ed3m nh\u1eefng con n\u00e0o<\/strong>? \u00c1p d\u1ee5ng \u0111\u00fang quy lu\u1eadt th\u00ec ta s\u1ebd c\u00f3 10 b\u1ed9 k\u00e9p l\u1ec7ch<\/strong> l\u00e0 05, 50, 16, 61, 27, 72, 38, 83, 49, 94.<\/strong><\/p>\nHi\u1ec7n nay c\u00f3 r\u1ea5t nhi\u1ec1u c\u00e1ch b\u1eaft l\u00f4 \u0111\u1ec1 k\u00e9p l\u1ec7ch hi\u1ec7u qu\u1ea3 d\u1ef1a theo b\u1ea1c nh\u1edb, \u0111\u1ea7u \u0111u\u00f4i c\u00e2m, l\u00f4 \u0111\u1ec1 r\u01a1i\u2026 m\u00e0 anh em c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng.<\/p>\n<\/span>Kh\u00e1i ni\u1ec7m v\u1ec1 k\u00e9p b\u1eb1ng<\/h2>\nK\u00e9p b\u1eb1ng<\/strong> l\u00e0 kh\u00e1i ni\u1ec7m v\u1ec1 c\u00e1ch b\u1eaft l\u00f4 c\u00f3 2 ch\u1eef s\u1ed1 \u1edf h\u00e0ng ch\u1ee5c v\u00e0 h\u00e0ng \u0111\u01a1n v\u1ecb gi\u1ed1ng nhau, \u0111\u00e2y l\u00e0 d\u1ea1ng k\u00e9p ph\u1ed5 bi\u1ebfn v\u00e0 d\u1ec5 nh\u1eadn bi\u1ebft nh\u1ea5t.<\/p>\nV\u1edbi \u0111\u1ecbnh ngh\u0129a \u0111\u00f3 th\u00ec ch\u00fang ta ho\u00e0n to\u00e0n c\u00f3 th\u1ec3 tr\u1ea3 l\u1eddi k\u00e9p b\u1eb1ng c\u00f3 t\u1ed5ng c\u1ed9ng 10 con l\u00f4 g\u1ed3m: 00, 11, 22, 33, 44, 55, 66, 77, 88, 99.<\/strong><\/p>\nC\u00f2n n\u1ebfu trong trong tr\u01b0\u1eddng h\u1ee3p \u201cr\u1ed1i tr\u00ed\u201d kh\u00f4ng bi\u1ebft k\u00e9p b\u1eb1ng bao nhi\u00eau con th\u00ec c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng c\u00e1c ph\u1ea7n m\u1ec1m l\u1ea5y d\u00e0n nhanh c\u0169ng r\u1ea5t \u0111\u01a1n gi\u1ea3n.<\/p>\n<\/span>\u0110\u1ec1 s\u00e1t k\u00e9p l\u00e0 sao?<\/h2>\nS\u00e1t k\u00e9p<\/strong> l\u00e0 kh\u00e1i ni\u1ec7m v\u1ec1 c\u00e1ch b\u1eaft m\u1ed9t con l\u00f4 c\u00f3 c\u00e1c s\u1ed1 li\u1ec1n tr\u00ean v\u00e0 li\u1ec1n d\u01b0\u1edbi c\u1ee7a m\u1ed9t con k\u00e9p, c\u00f3 th\u1ec3 hi\u1ec3u l\u00e0 +1 v\u00e0 -1<\/p>\nM\u1ed9t con k\u00e9p s\u1ebd c\u00f3 2 s\u00e1t k\u00e9p \u0111i li\u1ec1n theo \u0111\u00f3. Khi k\u1ebft h\u1ee3p v\u1edbi c\u00e1ch ph\u00e2n chia k\u00e9p \u1edf tr\u00ean th\u00ec ta c\u0169ng s\u1ebd c\u00f3 s\u00e1t k\u00e9p b\u1eb1ng v\u00e0 s\u00e1t k\u00e9p l\u1ec7ch.<\/p>\nN\u1ebfu nh\u01b0 nh\u1eafc \u0111\u1ebfn d\u00e0n<\/strong> \u0111\u1ec1 s\u00e1t k\u00e9p<\/strong> th\u00ec ch\u00fang ta n\u00ean c\u0169ng ng\u1ea7m hi\u1ec3u \u0111\u00f3 l\u00e0 t\u1ed5ng h\u1ee3p d\u00e0n s\u1ed1 c\u1ee7a hai d\u1ea1ng d\u01b0\u1edbi \u0111\u00e2y.<\/p>\n<\/p>\n\u0110\u1ec1 s\u00e1t k\u00e9p bao g\u1ed3m c\u00f3 40 con.<\/strong><\/p>\n<\/div>\n<\/span>a) B\u1ed9 s\u00e1t k\u00e9p l\u1ec7ch<\/h3>\nB\u1ed9 s\u00e1t k\u00e9p l\u1ec7ch<\/strong> l\u00e0 nh\u1eefng con s\u1ed1 li\u1ec1n k\u1ec1 v\u1edbi k\u00e9p l\u1ec7ch.<\/p>\nNh\u01b0 v\u1eady ta c\u00f3 b\u1ed9 s\u1ed1 s\u00e1t k\u00e9p l\u1ec7ch g\u1ed3m 20 con l\u00e0: 04, 06, 49, 51, 60, 62, 71, 73, 37, 39, 48, 50, 93, 95, 15, 17, 82, 84, 26, 28.<\/strong><\/p>\n<\/span>b) S\u00e1t k\u00e9p b\u1eb1ng<\/h3>\nB\u1ed9 s\u00e1t k\u00e9p b\u1eb1ng<\/strong> l\u00e0 nh\u1eefng con s\u1ed1 li\u1ec1n k\u1ec1 tr\u01b0\u1edbc sau v\u1edbi d\u00e0n k\u00e9p b\u1eb1ng.<\/p>\nTheo \u0111\u00fang quy lu\u1eadt th\u00ec ta c\u00f3 20 s\u1ed1 s\u00e1t k\u00e9p l\u1ec7ch: 10, 10, 12, 21, 23, 32, 34, 43, 45, 54, 56, 65, 67, 76, 78, 87, 89, 98, 90, 09.<\/strong><\/p>\nV\u00ed d\u1ee5 n\u00f3i \u0111\u00e1nh d\u00e0n \u0111\u1ec1 s\u00e1t k\u00e9p b\u1eb1ng th\u00ec th\u01b0 k\u00fd s\u1ebd ng\u1ea7m hi\u1ec3u l\u00e0 anh em \u0111ang \u0111\u00e1nh c\u00e1c con s\u1ed1 tr\u00ean m\u00e0 kh\u00f4ng c\u1ea7n ph\u1ea3i li\u1ec7t k\u00ea. R\u1ea5t ti\u1ec7n \u0111\u00fang kh\u00f4ng n\u00e0o?<\/p>\nC\u00f2n n\u1ebfu nh\u01b0 c\u00f3 ai h\u1ecfi \u0111\u1ec1 s\u00e1t k\u00e9p c\u00f3 bao nhi\u00eau con<\/strong> th\u00ec l\u1ea1i c\u00e0ng \u0111\u01a1n gi\u1ea3n. Anh em l\u1ea1i \u0111\u01b0\u1ee3c d\u1ecbp tr\u1ed5 t\u00e0i \u0111\u1ecdc vanh v\u00e1ch 40 con s\u1ed1 tr\u00ean d\u1ef1a v\u00e0o quy t\u1eafc m\u00e0 soi c\u1ea7u v\u1eeba ch\u1ec9 \u0111i\u1ec3m.<\/p>\n<\/span>\u0110\u1ecbnh ngh\u0129a k\u00e9p \u00e2m<\/h2>\nK\u00e9p \u00e2m<\/strong> l\u00e0 c\u00e1ch ch\u01a1i m\u00e0 anh em s\u1ebd l\u1ef1a ch\u1ecdn cho m\u00ecnh m\u1ed9t con l\u00f4 c\u00f3 2 ch\u1eef s\u1ed1 h\u00e0ng ch\u1ee5c v\u00e0 h\u00e0ng \u0111\u01a1n v\u1ecb l\u00e0 b\u00f3ng \u00e2m c\u1ee7a nhau theo quy lu\u1eadt b\u00f3ng s\u1ed1 trong l\u00f4 \u0111\u1ec1.<\/p>\nC\u1ee5 th\u1ec3 quy t\u1eafc n\u00e0y nh\u01b0 sau:<\/p>\n\n0<\/strong> c\u00f3 b\u00f3ng \u00e2m l\u00e0 7<\/strong> v\u00e0 chi\u1ec1u ng\u01b0\u1ee3c l\u1ea1i v\u1eabn \u0111\u00fang.<\/li>\n1<\/strong> l\u00e0 b\u00f3ng \u00e2m c\u1ee7a 4<\/strong> v\u00e0 ng\u01b0\u1ee3c l\u1ea1i.<\/li>\n2<\/strong> l\u00e0 b\u00f3ng \u00e2m c\u1ee7a 9<\/strong>, ng\u01b0\u1ee3c l\u1ea1i c\u0169ng \u0111\u00fang.<\/li>\n3<\/strong> l\u00e0 b\u00f3ng \u00e2m c\u1ee7a 6 v\u00e0 6<\/strong> c\u0169ng l\u00e0 b\u00f3ng \u00e2m c\u1ee7a 3.<\/strong><\/li>\n5<\/strong> c\u00f3 b\u00f3ng \u00e2m l\u00e0 8<\/strong> v\u00e0 ng\u01b0\u1ee3c l\u1ea1i.<\/li>\n<\/ul>\nT\u1eeb quy lu\u1eadt \u0111\u00f3 th\u00ec ta c\u00f3 \u0111\u01b0\u1ee3c d\u00e0n k\u00e9p \u00e2m g\u1ed3m: 14, 41, 07, 70, 29, 92, 58, 85, 36, 63.<\/strong><\/p>\n<\/span>L\u1eddi k\u1ebft<\/h2>\nQua chia s\u1ebb tr\u00ean \u0111\u00e2y th\u00ec ch\u1eafc ch\u1eafn anh em \u0111\u00e3 bi\u1ebft \u0111\u01b0\u1ee3c l\u00f4 k\u00e9p l\u00e0 g\u00ec<\/strong> v\u00e0 c\u00e1ch ph\u00e2n bi\u1ec7t k\u00e9p b\u1eb1ng, k\u00e9p l\u1ec7ch, s\u00e1t k\u00e9p, k\u00e9p \u00e2m<\/strong> r\u1ed3i \u0111\u00fang kh\u00f4ng n\u00e0o? T\u1eeb nh\u1eefng ki\u1ebfn th\u1ee9c n\u00e0y ch\u00fang ta s\u1ebd t\u1ef1 tin h\u01a1n trong d\u1ef1 \u0111o\u00e1n s\u1ed1 \u0111\u1eb9p m\u1ed7i ng\u00e0y c\u1ee7a m\u00ecnh.<\/p>\n<\/article>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n\n\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\nch\u00ednh x\u00e1c \u0103n s\u1ed1 cao c\u1ea5p<\/h3>\n\n\n\nc\u1ea7u \u0111\u1ec1 ch\u00ednh x\u00e1c b\u1ea1ch th\u1ee7 l\u00f4 mb<\/a><\/strong><\/td>\n<\/td>\n<\/tr>\n\nc\u1ea7u \u0111\u1ec1 ch\u00ednh x\u00e1c b\u1ea1ch th\u1ee7 l\u00f4 v\u1ec1 2 nh\u00e1y<\/a><\/strong><\/span><\/td>\n<\/td>\n<\/tr>\n\nc\u1ea7u \u0111\u1ec1 ch\u00ednh x\u00e1c song th\u1ee7 l\u00f4 mb<\/a><\/strong><\/span><\/td>\n<\/td>\n<\/tr>\n\nc\u1ea7u \u0111\u1ec1 ch\u00ednh x\u00e1c b\u1ea1ch th\u1ee7 l\u00f4 k\u00e9p mb<\/a><\/strong><\/span><\/td>\n<\/td>\n<\/tr>\n\nc\u1ea7u \u0111\u1ec1 ch\u00ednh x\u00e1c song th\u1ee7 l\u00f4 k\u00e9p mb<\/a><\/strong><\/span><\/td>\n<\/td>\n<\/tr>\n\nc\u1ea7u \u0111\u1ec1 ch\u00ednh x\u00e1c b\u1ea1ch th\u1ee7 \u0111\u1ec1 mb<\/a><\/strong><\/span><\/td>\n<\/td>\n<\/tr>\n\nc\u1ea7u \u0111\u1ec1 ch\u00ednh x\u00e1c song th\u1ee7 \u0111\u1ec1 mb<\/a><\/strong><\/span><\/td>\n<\/td>\n<\/tr>\n\nc\u1ea7u \u0111\u1ec1 ch\u00ednh x\u00e1c d\u00e0n \u0111\u1ec1 4 s\u1ed1 mb<\/a><\/strong><\/span><\/td>\n<\/td>\n<\/tr>\n\nc\u1ea7u \u0111\u1ec1 ch\u00ednh x\u00e1c d\u00e0n \u0111\u1ec1 6 s\u1ed1 mb<\/a><\/strong><\/span><\/td>\n<\/td>\n<\/tr>\n\nc\u1ea7u \u0111\u1ec1 ch\u00ednh x\u00e1c d\u00e0n \u0111\u1ec1 8 s\u1ed1 mb<\/a><\/strong><\/span><\/td>\n<\/td>\n<\/tr>\n\nc\u1ea7u \u0111\u1ec1 ch\u00ednh x\u00e1c d\u00e0n \u0111\u1ec1 10 s\u1ed1 mb<\/a><\/strong><\/span><\/td>\n<\/td>\n<\/tr>\n\nc\u1ea7u \u0111\u1ec1 ch\u00ednh x\u00e1c d\u00e0n l\u00f4 4 s\u1ed1 mb<\/a><\/strong><\/span><\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\nch\u1ed1t c\u1ea7u h\u00f4m nay s\u1ed1 mi\u1ec1n b\u1eafc<\/h3>\n\n\n\nsoi c\u1ea7u l\u1ea5y s\u1ed1 d\u00e0n l\u00f4 6 s\u1ed1 mb<\/a><\/strong><\/td>\n<\/td>\n<\/tr>\n\nsoi c\u1ea7u l\u1ea5y s\u1ed1 d\u00e0n l\u00f4 8 s\u1ed1 mb<\/a><\/strong><\/span><\/td>\n<\/td>\n<\/tr>\n\nsoi c\u1ea7u l\u1ea5y s\u1ed1 d\u00e0n l\u00f4 xi\u00ean 2 mb<\/a><\/strong><\/span><\/td>\n<\/td>\n<\/tr>\n\nsoi c\u1ea7u l\u1ea5y s\u1ed1 d\u00e0n l\u00f4 xi\u00ean 3 mb<\/a><\/strong><\/span><\/td>\n<\/td>\n<\/tr>\n\nsoi c\u1ea7u l\u1ea5y s\u1ed1 d\u00e0n l\u00f4 xi\u00ean 4 mb<\/a><\/strong><\/span><\/td>\n<\/td>\n<\/tr>\n\nsoi c\u1ea7u l\u1ea5y s\u1ed1 chu\u1ea9n 3 c\u00e0ng mb<\/a><\/strong><\/span><\/td>\n<\/td>\n<\/tr>\n\nsoi c\u1ea7u l\u1ea5y s\u1ed1 3 c\u00e0ng 2 s\u1ed1 mb<\/a><\/strong><\/span><\/td>\n<\/td>\n<\/tr>\n\nsoi c\u1ea7u l\u1ea5y s\u1ed1 d\u00e0n l\u00f4 10 s\u1ed1 mb<\/a><\/strong><\/span><\/td>\n<\/td>\n<\/tr>\n\nsoi c\u1ea7u l\u1ea5y s\u1ed1 \u0111\u1ec1 \u0111\u1ea7u \u0111u\u00f4i mb<\/a><\/strong><\/span><\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\nch\u1ed1t c\u1ea7u l\u1ea5y s\u1ed1 mi\u1ec1n nam<\/h3>\n\n\n\nsoi c\u1ea7u l\u1ea5y s\u1ed1 chu\u1ea9n x\u1ec9u ch\u1ee7 mn<\/a><\/strong><\/td>\n<\/td>\n<\/tr>\n\nsoi c\u1ea7u l\u1ea5y s\u1ed1 gi\u1ea3i \u0111\u1eb7c bi\u1ec7t mn<\/a><\/strong><\/span><\/td>\n<\/td>\n<\/tr>\n\nsoi c\u1ea7u l\u1ea5y s\u1ed1 chu\u1ea9n gi\u1ea3i 8 mn<\/a><\/strong><\/span><\/td>\n<\/td>\n<\/tr>\n\nsoi c\u1ea7u l\u1ea5y s\u1ed1 chu\u1ea9n bao l\u00f4 mn<\/a><\/strong><\/span><\/td>\n<\/td>\n<\/tr>\n\nsoi c\u1ea7u l\u1ea5y s\u1ed1 c\u1eb7p x\u1ec9u ch\u1ee7 mn<\/a><\/strong><\/span><\/td>\n<\/td>\n<\/tr>\n\nsoi c\u1ea7u l\u1ea5y s\u1ed1 chu\u1ea9n song th\u1ee7 l\u00f4 mn<\/a><\/strong><\/span><\/td>\n<\/td>\n<\/tr>\n\nsoi c\u1ea7u l\u1ea5y s\u1ed1 \u0111\u1ea7u \u0111u\u00f4i gi\u1ea3i 8 mn<\/a><\/strong><\/span><\/td>\n<\/td>\n<\/tr>\n\nsoi c\u1ea7u l\u1ea5y s\u1ed1 \u0111\u1ea7u \u0111u\u00f4i \u0111\u1eb7c bi\u1ec7t mn<\/a><\/strong><\/span><\/td>\n<\/td>\n<\/tr>\n\nsoi c\u1ea7u l\u1ea5y s\u1ed1 si\u00eau chu\u1ea9n l\u00f4 3 s\u1ed1 mn<\/a><\/strong><\/span><\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\nch\u1ed1t c\u1ea7u \u0103n s\u1ed1 mi\u1ec1n trung<\/h3>\n\n\n\nk\u1ebft qu\u1ea3 soi c\u1ea7u si\u00eau chu\u1ea9n x\u1ec9u ch\u1ee7 mt<\/a><\/strong><\/td>\n<\/td>\n<\/tr>\n\nk\u1ebft qu\u1ea3 soi c\u1ea7u gi\u1ea3i \u0111\u1eb7c bi\u1ec7t mt<\/a><\/strong><\/span><\/td>\n<\/td>\n<\/tr>\n\nk\u1ebft qu\u1ea3 soi c\u1ea7u si\u00eau chu\u1ea9n gi\u1ea3i 8 mt<\/a><\/strong><\/span><\/td>\n