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Các bạn giúp mình hai bài bất đẳng thức này nhé:
https://scontent.fda...5c5&oe=5BBACDEC
Đại úy
$$P_{\max}= \frac{2}{9}\Leftrightarrow x= \frac{1}{\sqrt{2}},\,y= ...,\,z= ...$$
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