Cho a;b;c$> 0$ .CMR:
$\frac{ab}{a+b+2c}+\frac{bc}{b+c+2a}+\frac{ca}{c+a+2b}\leq \frac{a+b+c}{4}$
Edited by datthyqt, 27-04-2017 - 17:53.
$\frac{ab}{a+b+2c}+\frac{bc}{b+c+2a}+\frac{ca}{c+a+2b}\leq \frac{a+b+c}{4}$
Started By datthyqt, 26-04-2017 - 21:52
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