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计算1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90

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4 | 2010-6-18 23:35:55 | 显示全部楼层 |阅读模式

1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90

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千问 | 2010-6-18 23:35:55 | 显示全部楼层

1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90 =(1-1/2)+(1/2-1/3)+(1/3-1/4).....(1/9+1/10)=1-1/2+1/2-1/3+1/3-1/4.....1/9-1/10=1-1/10=9/10
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千问 | 2010-6-18 23:35:55 | 显示全部楼层

9/10....

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千问 | 2010-6-18 23:35:55 | 显示全部楼层

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