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[不等式] 一道不等式

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longzaifei posted 2015-3-22 11:58 |Read mode
设$a,b,c>0,abc\le 1$,求证:
\[ \dfrac{a^2+b}{a^2+b^2+1}+\dfrac{b^2+c}{b^2+c^2+1}+\dfrac{c^2+a}{c^2+a^2+1} \le 2  \]

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