1, 1, 4, 13, 43, 142, ( )
2023-05-30
A.469 B.369 C.234 D.198
参考答案:A
参考答案:A
递推数列。第一项+第二项×3=第三项,依此类推,1+1×3=4,1+4×3=13,4+13×3=43,13+43×3=142,43+142×3=(469)。
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