Cho a,b,c>0 thỏa mãn $a^2+b^2+c^2=1$. CMR: $\sum \frac{a}{1+bc}\leq \sqrt{2}$
CMR: $\sum \frac{a}{1+bc}\leq \sqrt{2}$
Started By chatditvit, 25-04-2016 - 13:35
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Posted 25-04-2016 - 13:35
chatditvit
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