-1，3，-3，-3，-9，（ ?）A.-9 B.-4 C.-14 D.-45

作者: tihaiku 人气: - 评论: 0

问题 -1，3，-3，-3，-9，（ ?）

选项 A.-9 B.-4 C.-14 D.-45

答案 D

解析题干倍数关系明显，考虑做商。后项除以前项得到新数列：-3、-1、1、3，新数列为公差是2的等差数列，故新数列的下一项应为5，所求项为：-9×5=-45。故正确答案为D。

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