Cho a>b>0. CMR: $a+\frac{1}{a(a-b)}\geqslant 3$ 
bài này sai với a=2;b=1 –  khangnguyenthanh 18-01-13 08:51 PM

bị xóa vì bị trùng bởi Đức Vỹ 24-10-13 04:56 PM

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

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