n ∑(1+1/i^2)
问题描述:
n ∑(1+1/i^2)
答
看了你的补充,明白了.这样做:
证明:
(1+1/4)·(1+1/9)·(1+1/16)······(1+1/n^2)
=(5/4)(10/9)(17/16).[(n^2+1)/n^2]