非空子集怎么算-天气预报

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非空子集怎么算

更新时间： 2020-11-17 00:00:00

非空子集为2^n-1，子集个数为2^n，非空真子集为2^n-2，子集：N个元素中取0个，取一个，取2个，取N个，然后相加=2^n，其余的就减以下就可以了。集合里有一个元素，2个元素,3个元素分别把他们的子集，非空子集、非空真子集算出来就能发现规律了。

关键词：空子怎么

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