chứng minh nếu $a>b>0$ thi:
$1/ a\geq 2\sqrt{b(a -b)}$
$2/ 2a^3 - 12ab +12b^2 +1 \geq0$

bị xóa vì bị trùng bởi conangbuongbinh_catinh_xiteen@yahoo.com.vn, Đức Vỹ 05-06-14 03:36 PM

Câu hỏi này có nội dung hoàn toàn trùng với câu hỏi đã có.

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