với a,b,c>1 chứng minh
$2(\frac{log_{a}b}{a+b}+\frac{log_{b}c}{b+c}+\frac{log_{c}a}{a+c})\geq \frac{9}{a+b+c}$
$2(\frac{log_{a}b}{a+b}+\frac{log_{b}c}{b+c}+\frac{log_{c}a}{a+c})\geq \frac{9}{a+b+c}$
Started By Sonhai224, 21-03-2017 - 18:48
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