2/3,1/2,5/9,()11/15.括号里填什么啊?
A:2/5,B:6/11,C:3/4 D:7/12
人气:321 ℃ 时间:2020-06-30 03:22:21
解答
答案为7/12 1/2可以看为3/6.所以这个数列分母分别为3、6、9、12、15.分子为2、3、5、()、11.可以看出这几个数字都为质数,因此可以判断中间的数字为5和11之间的质数7.
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