$\frac{1}{1+a}+\frac{1}{1+b}+\frac{1}{1+c}\geq \frac{1}{1+\sqrt[4]{ab^3}} +\frac{1}{1+\sqrt[4]{bc^3}}+\frac{1}{1+\sqrt[4]{ca^3}}$
Edited by Be Strong, 21-12-2012 - 12:03.
Edited by Be Strong, 21-12-2012 - 12:03.
CMR $\forall a,b,c\geq 1$ ta có:
$\frac{1}{1+a}+\frac{1}{1+b}+\frac{1}{1+c}\geq \frac{1}{1+\sqrt[4]{ab^3}} +\frac{1}{1+\sqrt[4]{bc^3}}+\frac{1}{1+\sqrt[4]{ca^3}}$
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