19,4,18,3,16,1,17,( )A.5 B.4 C.3 D.2

作者: tihaiku 人气: - 评论: 0
问题 19,4,18,3,16,1,17,( )
选项 A.5 B.4 C.3 D.2
答案 D
解析 解析:本题初看较难,亦乱,但仔细分析便可发现,这是一道两个数字为一组的减法规律的题,19-4=15,18-3=15,16-1=15,那么,依此规律,( )内的数为 17-2=15。故本题的正确答案为 D。

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