1/1*2+1/2*3+1/3*4...+1/99*100+1/(2011*2012)

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1/1*2+1/2*3+1/3*4...+1/99*100+1/(2011*2012)1/1*2+1/2*3+1/3*4...+1/99*100+1/(2011*2012)1/1*2+1/2*3+1/

1/1*2+1/2*3+1/3*4...+1/99*100+1/(2011*2012)
1/1*2+1/2*3+1/3*4...+1/99*100+1/(2011*2012)

1/1*2+1/2*3+1/3*4...+1/99*100+1/(2011*2012)
1/n*(n+1)=1/n-1/(n+1)
所以1/1*2+1/2*3+1/3*4...+1/99*100=1-1/2+1/2-1/3+1/3+1/4...+1/99-1/100=1-1/100=99/100
所以1/1*2+1/2*3+1/3*4...+1/99*100+1/(2011*2012)=99/100+1/(2011*2012)=400567168/404613200=0.99

=1-1/2+1/2-1/3+1/3-1/4+......+1/2011-1/2012
=1-1/2012
=2011/2012

=(1-1/2)+(1/2-1/3)+(1/3-1/4)+···+1/2011-1/2012
=1-1/2012
=2011/2012