1/3+1/15+1/35+1/63+1/99+1/143

来源：学生作业帮助网编辑：六六作业网时间：2025/01/13 02:06:21

1/3+1/15+1/35+1/63+1/99+1/1431/3+1/15+1/35+1/63+1/99+1/1431/3+1/15+1/35+1/63+1/99+1/143=1-2/3+2/3-3/

1/3+1/15+1/35+1/63+1/99+1/143
1/3+1/15+1/35+1/63+1/99+1/143

1/3+1/15+1/35+1/63+1/99+1/143
=1-2/3+2/3-3/5+3/5-4/7+4/7-5/9+5/9-6/11+6/11-7/13
=1-7/13
=6/13