\frac{\mathrm{1} }{\mathrm{2a+b+6}+\frac{\mathrm{1} }{\mathrm{2b+c+6}+\frac{\mathrm{} }{\mathrm{2c+a+6}\leq\frac{1}{4}
xem lại đề xem bạn gõ latex đúng chưa, thêm dấu $ vô trước và sau phẫn gõ latex thì mới hiện thị được nhé –  ẩn ngư 19-12-13 08:27 PM

bị xóa vì bị trùng bởi white cloud, Đức Vỹ 20-12-13 08:36 AM

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

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