|1/2|-1|+|1/3-1/2|+|1/4-1/3|+|1/5-1/4|.|1/2012-1/2011|理由
来源：学生作业帮助网 编辑：六六作业网 时间：2024/12/18 23:48:33
|1/2|-1|+|1/3-1/2|+|1/4-1/3|+|1/5-1/4|.|1/2012-1/2011|理由|1/2|-1|+|1/3-1/2|+|1/4-1/3|+|1/5-1/4|.|1/20
|1/2|-1|+|1/3-1/2|+|1/4-1/3|+|1/5-1/4|.|1/2012-1/2011|理由
|1/2|-1|+|1/3-1/2|+|1/4-1/3|+|1/5-1/4|.|1/2012-1/2011|
理由
|1/2|-1|+|1/3-1/2|+|1/4-1/3|+|1/5-1/4|.|1/2012-1/2011|理由
|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