The sequence(序列) 1/1,1/2,2/2,1/3,2/3,3/3,1/4,2/4,3/4,4/4,1/5,2/5,等等,then the 2011th number is()
The sequence(序列) 1/1,1/2,2/2,1/3,2/3,3/3,1/4,2/4,3/4,4/4,1/5,2/5,等等,then the 2011th number is()
其他人气:933 ℃时间:2020-02-06 11:27:56
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总个数S=(1+n)n/2 当n=64时,S=2016 也就是说第2016个数是64/64 倒推第2011个数是,58/63
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