1/1*2+1/1*3+1*3*4+……+1/2000*1/20011/1*2+1/1*3+1/3*4+……+1/2000*1/2001
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1/1*2+1/1*3+1*3*4+……+1/2000*1/20011/1*2+1/1*3+1/3*4+……+1/2000*1/2001
1/1*2+1/1*3+1*3*4+……+1/2000*1/2001
1/1*2+1/1*3+1/3*4+……+1/2000*1/2001
1/1*2+1/1*3+1*3*4+……+1/2000*1/20011/1*2+1/1*3+1/3*4+……+1/2000*1/2001
1/1*2+1/2*3+1/3*4+……+1/2000*1/2001
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+……+(1/2000-1/2001)
=1-1/2001
=2000/2001
本题利用裂项公式:1/n(n+1)=1/n-1/(n+1)
1/1*2+1/2*3+1/3*4+……+1/2000*1/2001
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+……+(1/2000-1/2001)
=1-1/2001
=2000/2001
1/(1-1/2)/(1-1/3)/(1-1/4)/……/(1-1/2012)
(1/2+1/3+1/4+……+1/2013)(1+1/2+1/3+1/4+……+1/2012)-(1+1/2+1/3+……+1/2013)(1/2+……+1/2012)
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(1/1+2)+(1/1+2+3)+(1/1+2+3+4)+………+(1/1+2+3+………+100)
1+2+3+4+……+10000
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1+2+3+4……+101
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(1/2+1/3+1//4+…+1/2005)(1+1/2+1/3+1/4+…+1/2004)-(1+1/2+1/3+1/4+…+1/2005)(1/2+1/3+1/4+…+1/2004计算1/2+1/3+1//4+…+1/2005)(1+1/2+1/3+1/4+…+1/2004)-(1+1/2+1/3+1/4+…+1/2005)(1/2+1/3+1/4+…+1/2004)