Cho $x, y, z >0$ và $x + y + z = 3$. Chứng minh $\frac{a}{b^{2}+c}+\frac{b}{c^{2}+a}+\frac{c}{a^{2}+b}\geq \frac{3}{2}$
$\sum\frac{c}{a^{2}+b}\geq \frac{3}{2}$
Started By Nguyễn Duy, 30-08-2016 - 22:17
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