21,27,40,61,94,148,()。 A.239 B.242 C.246 D.252

作者: tihaiku 人气: - 评论: 0
问题 21,27,40,61,94,148,()。 A.239 B.242 C.246 D.252
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答案 A
解析 相邻两数依次做差得到新的一组数字6,13,21,33,54,如此继续又得到7,8,12,21, 接下来是1,4,9,这时规律就明显了,分别写为12,22,32,则下一个数是42,即16。故所求数字为16 + 21+54+148 = 239。

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