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1/1*2+1/2*3+……+1/48*49+1/49*50=?
人气:140 ℃ 时间:2020-09-30 18:29:24
解答
1/1*2+1/2*3+……+1/48*49+1/49*50
=1-1/2+1/2-1/3+……+1/48-1/49+1/49-1/50
=1-1/50
=49/50
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