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$$\sum\limits_{cyc}\,\frac{\it{3}}{\it{a}^{\,\it{2}}- \it{bc}+ 3}\leqq \it{5}$$

* * * * * 1 votes 5 vars inequality inequalities #gallery...

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DOTOANNANG

DOTOANNANG

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Với $\it{0}< \it{a},\,\it{b},\,\it{c},\,\it{d},\,\it{e}\,\,,\,\,\sum\limits_{cyc}\,\it{ab}= \it{1}$ , chứng minh rằng:

$\sum\limits_{cyc}\,\frac{\it{3}}{\it{a}^{\,\it{2}}- \it{bc}+ 3}\leqq \it{5}$


Edited by DOTOANNANG, 30-12-2018 - 12:22.






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