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[不等式] 一道四元不等式

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hbghlyj posted 2020-4-23 11:00 |Read mode

a,b,c,d>0,abcd=1,求证\[\sum\limits_{cyc}\frac{(a-1)(c+1)}{bc+c+1}\ge0\]

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2025-6-8 06:56 GMT+8

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