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An=1/n^2 数列求和
An=1/n^2 数列(An)求和
人气:410 ℃ 时间:2020-03-08 17:56:59
解答
用初等方法暂时不能做
我见过得最容易的方法是把x^2展开成Fourier级数
答案是圆周率平方除以6
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