计算：l1/3-1/2l+l1/4-1/3l+l1/5+1/4l+……+l1/2012-1/2011l

分类: 作业答案 • 2021-12-31 11:56:44

问题描述：

答

l1/3-1/2l+l1/4-1/3l+l1/5-1/4l+……+l1/2012-1/2011l
=1/2-1/3+1/3-1/4+1/4-1/5+...+1/2011-1/2012
=1/2-1/2012
=1005/2012