1/2+1/6+1/12+1/20+1/30+1/42 1/ 132个是第几个数字
人气:288 ℃ 时间:2019-12-19 14:51:33
解答
1/2+1/6+1/12+1/20+1/30+1/42 ……1/ 132个是第11个数字
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