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2 năm trước
Cho a,b,c là các số thực dương thỏa mãn abc=1.Tìm giá trị lớn nhất của biểu thức: A= $\frac{1}{a^2+2b^2+3}$ + $\frac{1}{b^2+2c^2+3}$ + $\frac{1}{c^2+2a^2+3}$
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