Với $a,b,c\geq 0$ sao cho $ab + bc +ca = 3$. Hãy chúng minh điều sau đúng:
$\sum \frac{\sqrt{a+b}}{c+3ab} \geq \frac{3\sqrt{2}}{4}$
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$\sum \frac{\sqrt{a+b}}{c+3ab} \geq \frac{3\sqrt{2}}{4}$
Started By VGNam, 16-04-2024 - 22:36
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