2⼀1x3+2⼀3x5+2⼀5x7+…+2⼀2011x2013

2024-12-29 07:02:16
推荐回答(1个)
回答1:

2/1x3+2/3x5+2/5x7+…+2/2011x2013
=1-1/3+1/3-1/5+1/5-1/7+1/7-……-1/2011+1/2011-1/2013
=1-1/2013
=2012/2013