答：各项绝对值内的代数式都是负数
|1/2-1|+|1/3-1/2|+|1/4-1/3|+|1/5-1/4|+……+|1/2012-1/2011|
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+.+(1/2011-1/2012)
=1-1/2012
=2011/2012