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1/2+1/6+1/12+1/20+1/30+1/42+……+1/110=?
急用!
人气:459 ℃ 时间:2020-04-16 07:30:07
解答
1/2+1/6+1/12+1/20+1/30+1/42+……+1/110
=1-1/2+1/2-1/3+1/3-1/4+……+1/10-1/11
=1-1/11
=10/11
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