|ab-2|+(1-b)²=0
所以ab-2=0
1-b=0
所以b=1
a=2/b=2
所以原式=1/1×2+1/2×3+……+1/2011×2012
=1-1/2+1/2-1/3+……+1/2011-1/2012
=1-1/2012
=2011/2012
|ab-2|+(1-b)²=0
所以ab-2=0
1-b=0
所以b=1
a=2/b=2
所以原式=1/1×2+1/2×3+……+1/2011×2012
=1-1/2+1/2-1/3+……+1/2011-1/2012
=1-1/2012
=2011/2012