The sequence 1/1,1/2,2/2,1/3,2/3,3/3,1/4,2/4,3/4,4/4,1/5,2/5…,then the 2011th number is _.
英汉小词典:sequence序列
人气:180 ℃ 时间:2020-04-13 01:21:05
解答
学过数列的话你就知道这个通项公式是Sn = n(n+1)/2
将2011代入,解
2011 = n(n+1)/2
得n = 62.9
因此该数字的分母是63,分子是2011 - 62×63/2 = 58
即该数字为58/63.
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