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$\Sigma \frac{a}{a+\sqrt{(a+2b)(a+2c)}}\leqslant \frac{3}{4}$

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Phan Tien Ngoc

Phan Tien Ngoc

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Cho a,b,c là các số thực dương. Chứng minh:

$\Sigma \frac{a}{a+\sqrt{(a+2b)(a+2c)}}\leqslant \frac{3}{4}.$


Edited by halloffame, 17-02-2017 - 18:53.






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