cho ab+bc+ca =1.CMR $\sum \frac{1}{c\sqrt{a^{2}+b^{2}}}\geq \frac{9}{2\sqrt{3}-3\sqrt{6}abc}$
$\sum \frac{1}{c\sqrt{a^{2}+b^{2}}}\geq \frac{9}{2\sqrt{3}-3\sqrt{6}abc}$
Started By nam8298, 11-10-2013 - 12:45
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