1-1/2-1/6-1/12-1/20-.1/2011*2012

问题描述:

1-1/2-1/6-1/12-1/20-.1/2011*2012
1个回答 分类:数学 2014-10-02

问题解答:

我来补答
1-1/2-1/6-1/12-1/20-.1/2011*2012
=1-(1/1×2+1/2×3+1/3×4+1/4×5+.+1/2011*2012)
=1-(1-1/2+1/2-1/3+.+1/2011-1/2012)
=1-(1-1/2012)
=1-1+1/2012
=1/2012
 
 
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