按规律填数:2分之1,负5分之2,负17分之4第n个数用n表示?
按规律填数:2分之1,负5分之2,负17分之4第n个数用n表示?
数学人气:391 ℃时间:2019-08-21 20:32:53
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一个分数,分子-1的n+1次方,再乘以n;分母n的平方,再加1.
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