3,7,11,21,26,31,24,( ) 选项 25 28 31 33
人气：375 ℃ 时间：2020-06-20 10:22:52
解答
答案：A.
奇数列：3,11,26,24为二级等差数列公差为3；即一级相减后：8,5,2……
偶数列：7,21,31,（）为二级等差数列公差为4.即一级相减后：14,10,6……
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