初１数学题目，／／／

|AB-2|+|B-1|=0

所以A=2, B=1

1/AB+1/(A+1)*(B+1)+1/(A+2)*(B+2)...1/(A+2004)*(B+2004)

=(1-1/2)+(1/2-1/3)+(1/3-1/4)...(1/2005-1/2006)

=1+(-1/2+1/2)+(-1/3+1/3)...(-1/2005+1/2005)-1/2006

=1-1/2006

=2005/2006

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