1/1*2+1/2*3+1/3*4+1/4*5+.+1/2005*2006

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1/1*2+1/2*3+1/3*4+1/4*5+.+1/2005*2006

1/1*2+1/2*3+1/3*4+1/4*5+.+1/2005*2006
1/1*2+1/2*3+1/3*4+1/4*5+.+1/2005*2006

1/1*2+1/2*3+1/3*4+1/4*5+.+1/2005*2006
1/1*2+1/2*3+1/3*4+1/4*5+.+1/2005*2006
=1-1/2+1/2-1/3+1/3-1/4+.+1/2005-1/2006
=1-1/2006
=2005/2006

=(1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+……+(1/2005-1/2006)
=1-1/2006
=2005/2006
两个连续自然数倒数的积等于倒数的差