1/1x3+1/3x5+1/5x7+.+1/2009x2011=

来源：学生作业学帮网编辑：学帮网时间：2024/05/14 07:37:12

1/1x3+1/3x5+1/5x7+.+1/2009x2011
=(1/2)*(1-1/3+1/3-1/5+1/5-1/7_.+1/2009-1/2011)
=(1/2)*(1-1/2011)
=1005/2011

1005/2011