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1/1x2+1/2x3+1/3x4+...+1/49x50怎么计算
人气:174 ℃ 时间:2019-11-06 05:49:11
解答
1/1x2+1/2x3+1/3x4+...+1/49x50
=1-1/2+1/2-1/3+1/3-1/4+……+1/49-1/50
=1-1/50
=49/50
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