1/1x2+1/2X3+1/3X4+~+1/2005X2006

分类: 作业答案 • 2021-12-19 16:55:19

问题描述：

答

2005/2006

答

1/1x2+1/2X3+1/3X4+~+1/2005X2006
=1-1/2+1/2-1/3+1/3-1/4++~+1/2005-1/2006
=1-1/2006
=2005/2006