1/15+1/35+1/63+1/99
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/29 15:34:43
![1/15+1/35+1/63+1/99](/uploads/image/z/435663-63-3.jpg?t=1%2F15%2B1%2F35%2B1%2F63%2B1%2F99)
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1/15+1/35+1/63+1/99
1/15+1/35+1/63+1/99
1/15+1/35+1/63+1/99
1/15+1/35+1/63+1/99
=1/3*5+1/5*7+1/7*9+1/9*11
=(1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11)*1/2
=(1/3-1/11)*1/2
=4/33