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[组合] 组合数求和

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longzaifei Post time 2015-3-20 09:25 |Read mode

求 $\dfrac{1}{C_{2n}^1} -\dfrac{1}{C_{2n}^2} +\dfrac{1}{C_{2n}^3} -\dfrac{1}{C_{2n}^4} +......-\dfrac{1}{C_{2n}^{2n}} $

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战巡 Post time 2015-3-20 10:04

回复 1# longzaifei

kuing.cjhb.site/forum.php?mod=viewthread&tid=2774&extra= ... e%26amp%3Btypeid%3D5

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Author| longzaifei Post time 2015-3-20 10:32

厉害

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