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(1-½)+(½-1/3)+(1/3-1/4)+...+(1/2009-1/2010)=(1-½)+(½-1/3)+(1/3-1/4)+...+(1/2009-1/2010)=最好拖式

题目详情
(1-½)+(½-1/3)+(1/3-1/4)+ ...+(1/2009 - 1/2010) =
(1-½)+(½-1/3)+(1/3-1/4)+ ...+(1/2009 - 1/2010) = 最好拖式
▼优质解答
答案和解析
(1-½)+(½-1/3)+(1/3-1/4)+ ... +(1/2009 - 1/2010) = 1+(-½+½)+(-1/3+1/3)+(-1/4+1/4)+ ... (-1/2009 +1/2009) - 1/2010=1-1/2010=2009/2010
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