3,15, 6,17,9,20, 12, 24,( ),( )。A. 15,30 B. 15,31 C. 18,36 D. 15,29

作者: tihaiku 人气: - 评论: 0
问题 3,15, 6,17,9,20, 12, 24,( ),( )。
选项 A. 15,30 B. 15,31 C. 18,36 D. 15,29
答案 D
解析 本题考核分组数列。数列交叉分组可以分成3,1,9,12,()和15,17,20,24,()两个数列。前一组数列是公差为3的等差数列,下一项为12 + 3 = 15;后二组数列 是公差为1的二级等差数列,下一项为24+5 = 29。故括号中应填入的数字是15和29。

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