1/7,25, 2, 27, ( )。A.1 B. 16 C.36 D.49

作者: tihaiku 人气: - 评论: 0
问题 1/7,25, 2, 27, ( )。
选项 A.1 B. 16 C.36 D.49
答案 A
解析 本数列可转化为7-1,52,21,33,先看指数-1,2,1,3,可知为和数列,即-1 + 2 = 1,2+1 = 3,推知空缺处指数为1+3 = 4;再看底数为7,5,2,3,…,可知为差数列,即7-5 = 2,5-2 = 3,推知空缺处底数为2-3=-1。因此,空缺项为(-1)4=1,故选A。

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