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HVHai

Member Since 09-02-2014
Offline Last Active 30-08-2015 - 20:35

Posted by HVHai on 18-02-2014 - 17:49

Chứng minh:

$\frac{1}{x}+\frac{1}{y}+\frac{1}{z}\geq \frac{9}{x+y+z}$

Giúp mình nha, mình cần gấp

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