1/3+1/15+1/35+1/63+1/99+1/143
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/05 20:56:02
![1/3+1/15+1/35+1/63+1/99+1/143](/uploads/image/z/85831-7-1.jpg?t=1%2F3%2B1%2F15%2B1%2F35%2B1%2F63%2B1%2F99%2B1%2F143)
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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