需要几个数能保证算出24点? - 知乎
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首先可以证明如果n个数(n≥8)可以保证任意组合都能算出,那么大于 n+1 个数也可以保证。 定理一:无上界定理 证明:若有任意的k数组合,k>n+1≥9 则一定存在一组重复的数 a,a,且有 a-a=0 这样我们可以任选 (k-n-2) 个数与 a-a 相乘得到0,且剩余的n个数由假设可以构成24点。将两部分相加可以得到 ...
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