1/m(m+1)+1/(m+1)(m+2)+1/(m+2)(m+3)+.+1/(m+9)(m+10)

比烟花kk百倍2022-10-04 11:39:541条回答

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树叉 共回答了19个问题 | 采纳率84.2%
∵ 1/m(m+1) = 1/m - 1/(m+1),
1/(m+1)(m+2) = 1/(m+1) - 1/(m+2)
1/(m+2)(m+3) = 1/(m+2) - 1/(m+3)
所以原式 = 1/m - 1/(m+1) + 1/(m+1) - 1/(m+2) + 1/(m+2) - 1/(m+3) ...+ 1/(m+9) - 1/(m+10)
= 1 - 1/(m+10)
= (m+9)/(m+10)
1年前

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kaikai11111年前1
一方大印 共回答了25个问题 | 采纳率96%
1/m(m+1)=1/m-1/(m+1)
裂项法
所以原式=1/m-1/(m+1)+1/(m+1)-1/(m+2)+……+1/(m+9)-1/(m+10)
=1/m-1/(m+10)
=10/m(m+10)

大家在问