1/1X2+1/2X3+1/3X4+1/4X5+1/5X6……1/2007X2008

hrfki2022-10-04 11:39:541条回答

1/1X2+1/2X3+1/3X4+1/4X5+1/5X6……1/2007X2008
加完后等多少?
答案不要太长,初一新生水平.
力谢.

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juexu 共回答了13个问题 | 采纳率84.6%: 1/1X2+1/2X3+1/3X4+1/4X5+1/5X6……1/2007X2008
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+……+1/2007-1/2008
=1-1/2008
=2007/2008; 1年前

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