Cho x,y>0 thỏa mãn x+y=1. Chứng minh:
a) $x\sqrt{1-x^{2}}$+$  y\sqrt{1-y^{2}}$$\leq $$\frac{\sqrt{3}}{2}$
có đứa ra rồi mà –  nguyenquangtruonghktcute 30-12-15 08:35 PM

bị xóa vì bị trùng bởi Confusion 16-06-16 08:20 PM

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

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