Cho $a,b,c>0, abc=1$. Chứng minh rằng:$\sum \frac{a+3}{(a+1)^2}\geq 3$
Edited by phanquockhanh, 30-08-2013 - 22:20.
$\sum \frac{a+3}{(a+1)^2}\geq 3$
Started By phancuong123, 30-08-2013 - 21:55
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