Cho các số dương $a,b,c$ thỏa mãn $ab+bc+ca=3$. Chứng minh rằng :
$\frac{a}{a^{2}+7}+\frac{b}{b^{2}+7}+\frac{c}{c^{2}+7}\leq \frac{3}{8}$
Edited by MoMo123, 22-10-2017 - 21:52.
Cho $ab+bc+ca=3$ Chứng minh rằng $\sum \frac{a}{a^{2}+7} \leq \frac{3}{8}$
Started By hdd1234, 22-10-2017 - 21:26
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