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1/2+1/6+1/12+1/20+1/30+1/42 用裂项法
人气:296 ℃ 时间:2020-04-10 14:04:56
解答
1/2+1/6+1/12+1/20+1/30+1/42
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7
=1-1/7
=6/7
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