计算:1/1x2+1/2X3+1/3x4+...+1/2009x2010

分类: 作业答案 • 2021-12-19 23:25:33

问题描述：

答

1/1x2+1/2X3+1/3x4+...+1/2009x2010
=1-1/2+1/2-1/3+1/3-1/4+……+1/2009-1/2010
=1-1/2010
=2009/2010