\u0110\u00e1nh \u0111\u1ec1 \u0111\u1ea7u \u0111u\u00f4i l\u00e0 sao?<\/h2>\n
\u0110\u00e1nh \u0111\u1ec1 \u0111\u1ea7u \u0111u\u00f4i<\/strong> \u0111\u01b0\u1ee3c chia l\u00e0m 3 h\u00ecnh th\u1ee9c ch\u00ednh g\u1ed3m: \u0110\u1ec1 \u0111\u1ea7u, \u0111\u00edt v\u00e0 \u0111\u00e1nh c\u1ea3 \u0111\u1ea7u \u0111\u00edt. M\u1ed7i c\u00e1ch ch\u01a1i kh\u00e1c nhau s\u1ebd c\u00f3 c\u01a1 c\u1ea5u tr\u1ea3 th\u01b0\u1edfng kh\u00e1c nhau nh\u01b0ng nh\u00ecn chung v\u1eabn s\u1ebd d\u1ef1a v\u00e0o 3 d\u1eef li\u1ec7u ch\u00ednh l\u00e0: Gi\u1ea3i \u0111\u1eb7c bi\u1ec7t, gi\u1ea3i 7 v\u00e0 gi\u1ea3i 8.<\/p>\n