7,7,9,17,43,( )A.119 B.117 C.123 D.121

作者: tihaiku 人气: - 评论: 0
问题 7,7,9,17,43,( )
选项 A.119 B.117 C.123 D.121
答案 C
解析 已知数列相邻两个数相减做差,得到新数列0、2、8、26,对新数列相邻两个数相减做差得到:2、6、18,是一个公比为3的等比数列,依此规律,括号中应是123

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