1/1x3+1/3x5+1/5x7.1/2009x2010+1/2011x2013
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/05 20:42:57
![1/1x3+1/3x5+1/5x7.1/2009x2010+1/2011x2013](/uploads/image/z/2511286-70-6.jpg?t=1%2F1x3%2B1%2F3x5%2B1%2F5x7.1%2F2009x2010%2B1%2F2011x2013)
1/1x3+1/3x5+1/5x7.1/2009x2010+1/2011x2013
1/1x3+1/3x5+1/5x7.1/2009x2010+1/2011x2013
1/1x3+1/3x5+1/5x7.1/2009x2010+1/2011x2013
1/1x3+1/3x5+1/5x7.1/2009x2011+1/2011x2013
=1/2×﹙1-1/3+1/3-1/5······+1/2009-1/2011+1/2011-1/2013)
=1/2×﹙1-1/2013﹚
=1006/2013