Cho `a,b,c` dương thỏa mãn `a+b+c=1` CMR:`(10a)/(1+a^2) +(10b)/(1+b^2)+(10c)/(1+c^2) <= 9`

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Cho `a,b,c` dương thỏa mãn `a+b+c=1`
CMR:`(10a)/(1+a^2) +(10b)/(1+b^2)+(10c)/(1+c^2) <= 9`

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