\u0110\u1ec1 k\u00e9p<\/strong><\/a> l\u00e0 nh\u1eefng b\u1ed9 s\u1ed1 bao g\u1ed3m 2 ch\u1eef s\u1ed1 gi\u00e1 tr\u1ecb c\u1ee7a h\u00e0ng ch\u1ee5c v\u00e0 h\u00e0ng \u0111\u01a1n v\u1ecb gi\u1ed1ng nhau n\u1eb1m trong kho\u1ea3ng 0 – 9 v\u00ed d\u1ee5 22, 66, 88. Hi\u1ec7n nay lo\u1ea1i c\u1ea7u n\u00e0y \u0111\u01b0\u1ee3c ph\u00e2n lo\u1ea1i th\u00e0nh nhi\u1ec1u h\u00ecnh th\u1ee9c kh\u00e1c nhau ph\u1ed5 bi\u1ebfn nh\u1ea5t l\u00e0 k\u00e9p l\u1ec7ch, k\u00e9p b\u1eb1ng, k\u00e9p \u00e2m v\u00e0 \u00e1t k\u00e9p.\u00a0<\/span><\/p>\nC\u00e1ch ch\u01a1i \u0111\u1ec1 k\u00e9p kh\u00e1 \u0111\u01a1n gi\u1ea3n d\u1ec5 th\u1ef1c hi\u1ec7n v\u00e0 c\u01a1 h\u1ed9i chi\u1ebfn th\u1eafng l\u00e0 r\u1ea5t l\u1edbn, d\u1ef1a tr\u00ean nh\u1eefng c\u00e1ch ph\u00e2n lo\u1ea1i ph\u1ed5 bi\u1ebfn hi\u1ec7n nay c\u00e1c d\u00e0n \u0111\u1ec1 k\u00e9p l\u1ea1i ch\u01b0a b\u1ed9 s\u1ed1 kh\u00e1c bi\u1ec7t \u0111\u1ec3 anh em c\u00f3 th\u1ec3 tham kh\u1ea3o v\u00e0 \u00e1p d\u1ee5ng:<\/span><\/p>\n\n- \u0110\u1ed1i v\u1edbi d\u00e0n \u0111\u1ec1 k\u00e9p b\u1eb1ng<\/strong>: bao g\u1ed3m to\u00e0n b\u1ed9 nh\u1eefng s\u1ed1 nh\u01b0 00 – 11 – 22 – 33 – 44 – 55 – 66 – 77 – 88 – 99.<\/span><\/li>\n
- \u0110\u1ed1i v\u1edbi d\u00e0n \u0111\u1ec1 k\u00e9p l\u1ec7ch<\/strong>: bao g\u1ed3m nh\u1eefng b\u1ed9 s\u1ed1 ch\u00ednh l\u00e0 050 –\u00a0 161 – 272 – 383 \u2013 494.<\/span><\/li>\n
- \u0110\u1ed1i v\u1edbi d\u00e0n \u0111\u1ec1 k\u00e9p \u00e2m<\/strong>: nh\u1eefng b\u1ed9 s\u1ed1 trong d\u00e0n \u0111\u1ec1 n\u00e0y bao g\u1ed3m 070 – 141 – 292 – 363 \u2013 585.<\/span><\/li>\n
- \u0110\u1ed1i v\u1edbi d\u00e0n \u0111\u1ec1 s\u00e1t k\u00e9p<\/strong>: bao g\u1ed3m nh\u1eefng b\u1ed9 s\u1ed1 ch\u1ee7 y\u1ebfu l\u00e0 010 – 909 – 121 – 232 – 343 – 454 – 565 – 676 – 787 \u2013 898.<\/span><\/li>\n<\/ul>\n