作者: tihaiku 人气: - 评论: 0
问题
选项
答案 B
解析 分数数列。分子构成公差为_2的等差数列,故第一项的分子是-1+2=1;分母构成公比为2的等比数列,故第一项的分母为4÷2=2,所以选1/2。

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