+1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72.+1/132=?

fasfasfasge2022-10-04 11:39:541条回答

+1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72.+1/132=?
另外加我口口1595682563,求方法

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邓依洋共回答了18个问题 | 采纳率77.8%: +1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72.+1/132
=1/1*2+1/2*3+1/3*4+1/4*5+1/5*6+1/6*7+.+1/11*12
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+.+1/11-1/12
=1-1/12
=11/12; 1年前

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