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chung minh BDT

- - - - - bat dang thuc

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#1
donbau

donbau

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cho xyz=1 chung minh

$P= \frac{x^{2}}{x+y+y^{3}z}+\frac{y^{2}}{y+z+z^{3}x}++\frac{z^{2}}{z+x+x^{3}y}\leq 1$







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