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数学
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1*2/1+2*3/1+3*4/1+…2010*2011/1等于?
人气:283 ℃ 时间:2019-10-11 05:50:03
解答
1/1*2+1/2*3+1/3*4+...+1/2010*2011
=1-1/2+1/2-1/3+1/3-1/4+...+1/2010-1/2011
=1-1/2011
=2010/2011
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