数字推理1 2 4 6 9 ()18
答案是13.
人气:185 ℃ 时间:2020-04-10 08:23:04
解答
我是这样考虑的:
前2项是1和2从第3项开始
f(n)=f(n-2)+f(n-1)+(4-n)
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