1/(1*2)+1/(2*3)+1/(3*4).+1/(2009*2010)
=[(1-1/2)+(1/2-1/3)+(1/3-1/4)+...+(1/2009-1/2010)]
=(1-1/2010)
=2009/2010
1/(1*20)+1/(2*3)+1/(3*4).+1/(2009*2010)=?
1/(1*20)+1/(2*3)+1/(3*4).+1/(2009*2010)=?
数学人气：585 ℃时间：2019-11-08 16:40:34
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