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[不等式] 四元不等式

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guanmo1 posted 2021-12-16 10:47 |Read mode

Last edited by hbghlyj 2025-3-19 08:28正数 $a b c d$ 满足 $a b c d=1$，求证：$\sum \frac{1}{a(b+1)} \geq 2$．

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kuing posted 2021-12-16 14:24

令 a=y/x 等变成熟知的 ∑x/(y+z) >=2

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2025-7-15 15:03 GMT+8

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