Cho a$\geq $49. Giả sử $\alpha ,\beta $>0 cho trước.
Biện luận $\alpha .a+\frac{\beta }{a}\geq ?$

bị xóa vì bị trùng bởi Đức Vỹ 25-10-13 10:53 PM

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

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