1/1X2+1/2X3+1/3X4+...+1/n(n+1)等于几?
1/1X2+1/2X3+1/3X4+...+1/n(n+1)等于几?
数学人气：487 ℃时间：2019-12-13 17:33:48
优质解答
=1-1/2+1/2-1/3+1/3-1/4……+1/n-1/(n+1)=1-1/(n+1)=n/(n+1)
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