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Posted by Moonlight Blue on 26-10-2017 - 12:57
Cho a,b,c$\geq$0. Chứng minh:
$\frac{b+c}{2a^{2}+bc}+\frac{a+c}{2b^{2}+ac}+\frac{a+b}{2c^{2}+ab}\geq \frac{6}{a+b+c}$