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28-02-2016 - 21:43
Cho a,b,c la các số thực dương thỏa mãn a+b+c=3CMR $\frac{a+1}{b^{2}+1} + \frac{b+1}{c^2+1{}} + \frac{c+1}{a^2+1{}} \geq 3$