D\u00e0n \u0111\u1ec1 56 s\u1ed1 c\u00f3 r\u1ea5t nhi\u1ec1u bi\u1ebfn th\u1ec3 kh\u00e1c nhau. Tuy nhi\u00ean c\u00f3 m\u1ed9t phi\u00ean b\u1ea3n c\u1ee7a d\u00e0n \u0111\u1ec1 n\u00e0y \u0111ang \u0111\u01b0\u1ee3c c\u00e1c b\u1ea1n ch\u01a1i l\u00f4 \u0111\u1ec1 \u00e1p d\u1ee5ng r\u1ea5t th\u00e0nh c\u00f4ng \u0111\u00f3 l\u00e0 d\u00e0n \u0111\u1ec1 b\u1ecf k\u00e9p b\u1eb1ng, b\u1ecf ch\u1ea1m 0, ch\u1ea1m 1. D\u00e0n \u0111\u1ec1 n\u00e0y g\u1ed3m nh\u1eefng s\u1ed1 n\u00e0o? C\u00e1ch s\u1eed d\u00f9ng d\u00e0n \u0111\u1ec1 n\u00e0y hi\u1ec7u qu\u1ea3 nh\u1ea5t ch\u00ednh l\u00e0 n\u1ed9i dung b\u00e0i vi\u1ebft c\u1ee7a ch\u00fang ta.<\/strong><\/p>\n
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