Cho a,b,c là các số dương.Tìm giá trị nhỏ nhất của biểu thức:

A =\frac{4a}{a+b+2c} + \frac{b+2b}{2a+b+c} - \frac{8c}{a+b+3c}

bị xóa vì bị trùng bởi kiuzdelzy99th@gmail.com, Trần Nhật Tân 10-10-13 11:45 PM

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

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