$ a, b, c> 0$, $\prod \left ( a+ b \right )= 8$. CMR:
$\frac{a+ b+ c}{3}\geq \sqrt[27]{\frac{a^{3}+ b^{3}+ c^{3}}{3}}$
$ a, b, c> 0$, $\prod \left ( a+ b \right )= 8$. CMR:
$\frac{a+ b+ c}{3}\geq \sqrt[27]{\frac{a^{3}+ b^{3}+ c^{3}}{3}}$
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