K\u00e9p b\u1eb1ng l\u00e0 g\u00ec<\/span><\/h3>\nK\u00e9p b\u1eb1ng c\u00f3 ngh\u0129a l\u00e0 nh\u1eefng con s\u1ed1 b\u1eb1ng nhau, s\u1ed1 gi\u1ed1ng nhau. B\u1ed9 k\u00e9p b\u1eb1ng g\u1ed3m 10 s\u1ed1:
\n00, 11, 22, 33, 44, 55, 66, 77, 88, 99<\/strong><\/p>\nTr\u1ea3i qua nhi\u1ec1u n\u0103m ph\u00e1t tri\u1ec3n t\u1eeb k\u00e9p b\u1eb1ng ng\u01b0\u1eddi ta \u0111\u00e3 th\u00eam c\u00e1c b\u1ed9 k\u00e9p kh\u00e1c \u0111\u00f3 l\u00e0 k\u00e9p l\u1ec7ch, s\u00e1t k\u00e9p v\u00e0 k\u00e9p \u00e2m.V\u1eady b\u1ed9 k\u00e9p \u0111\u00f3 c\u00f3 bao nhi\u1ec1u s\u1ed1?<\/p>\n
K\u00e9p l\u1ec7ch l\u00e0 g\u00ec<\/span><\/h3>\nK\u00e9p l\u1ec7ch \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n t\u1eeb m\u1ed9t lo\u1ea1i kh\u00e1c l\u00e0 b\u00f3ng l\u00f4 \u0111\u1ec1. M\u1ed7i m\u1ed9t s\u1ed1 \u0111\u1ec1u c\u00f3 b\u00f3ng l\u00f4 \u0111\u1ec1 t\u01b0\u01a1ng \u1ee9ng. Nh\u1eefng c\u1eb7p b\u00f3ng l\u00f4 \u0111\u1ec1 l\u00e0 b\u00f3ng c\u1ee7a nhau nh\u01b0 sau:<\/p>\n
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