1/6+1/12+1/20+1/30+1/42+1/56=?

学习时间:2026-08-15 12:29:44 阅读：783

1/6+1/12+1/20+1/30+1/42+1/56=?简便记算

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2026-08-15 12:29:44

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1/6+1/12+1/20+1/30+1/42+1/56=(1/2-1/3)+(1/3-1/4)+。。。+(1/7-1/8)=1/2+(1/3-1/3)+…+(1/7-1/7)-1/8=1/2-1/8=3/8