D\u00e0n \u0111\u1ec1 th\u00ec c\u00f3 r\u1ea5t nhi\u1ec1u. Nh\u01b0ng <\/span>d\u00e0n \u0111\u1ec1 74 s\u1ed1, t\u1ee9c chi\u1ebfm h\u01a1n 2\/3 s\u1ed1 con l\u00f4 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c x\u1ed5 s\u1ed1. T\u1ee9c n\u1ebfu ch\u1ecdn \u0111\u00e1nh t\u1edbi 74 th\u00ec t\u1ec9 l\u1ec7 \u0103n l\u00ean t\u1edbi 2\/3. Nh\u01b0ng l\u00e0m sao \u0111\u1ec3 t\u00ecm ra 64 con s\u1ed1 \u1ea5y ? Kh\u00f4ng c\u1ea7n ph\u1ea3i m\u1ea5t ti\u1ec1n, ch\u1ec9 c\u1ea7n theo d\u00f5i b\u00e0i vi\u1ebft sau \u0111\u00e2y, anh em ho\u00e0n to\u00e0n c\u00f3 th\u1ec3 t\u00ecm ra cho m\u00ecnh c\u00e1ch t\u00ednh <\/span>d\u00e0n \u0111\u1ec1 70 s\u1ed1<\/strong> \u0111\u00e1nh quanh n\u0103m<\/strong> d\u1ec5 \u0103n d\u1ec5 tr\u00fang nh\u1ea5t.<\/span><\/p>\n