1/1x5+1/5x9+.+1/2005x2009
来源：学生作业帮助网 编辑：六六作业网 时间：2024/12/18 21:07:08
1/1x5+1/5x9+.+1/2005x20091/1x5+1/5x9+.+1/2005x20091/1x5+1/5x9+.+1/2005x2009=1/4(1-1/5+1/5-1/9******+
1/1x5+1/5x9+.+1/2005x2009
1/1x5+1/5x9+.+1/2005x2009
1/1x5+1/5x9+.+1/2005x2009
=1/4(1-1/5+1/5-1/9******+1/2005-1/2009)
=(1-1/2009)/4
=502/2009