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[不等式] 一个较难的不等式证明题

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Tomath posted 2021-7-17 14:45 |Read mode
Last edited by Tomath 2021-7-17 15:17设$a,b,c\in R^{+}$,且$a+b+c=3$,证明:
$\sum \frac{1}{a\sqrt{2\left ( a^2+bc \right )}}\geqslant \sum \frac{1}{a+bc}$

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