1,如何证明含有k个元素的集合的真子集个数为2^k-1个2、设集合S={1,2,……,9},集合A={a,b,c}是S的子集,a,b,c满足a<b<c,c-b小于并等于6,那么满足条件的子集A的个数为多少.
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![1,如何证明含有k个元素的集合的真子集个数为2^k-1个2、设集合S={1,2,……,9},集合A={a,b,c}是S的子集,a,b,c满足a<b<c,c-b小于并等于6,那么满足条件的子集A的个数为多少.](/uploads/image/z/7092953-17-3.jpg?t=1%2C%E5%A6%82%E4%BD%95%E8%AF%81%E6%98%8E%E5%90%AB%E6%9C%89k%E4%B8%AA%E5%85%83%E7%B4%A0%E7%9A%84%E9%9B%86%E5%90%88%E7%9A%84%E7%9C%9F%E5%AD%90%E9%9B%86%E4%B8%AA%E6%95%B0%E4%B8%BA2%5Ek-1%E4%B8%AA2%E3%80%81%E8%AE%BE%E9%9B%86%E5%90%88S%3D%7B1%2C2%2C%E2%80%A6%E2%80%A6%2C9%7D%2C%E9%9B%86%E5%90%88A%3D%7Ba%2Cb%2Cc%7D%E6%98%AFS%E7%9A%84%E5%AD%90%E9%9B%86%2Ca%2Cb%2Cc%E6%BB%A1%E8%B6%B3a%EF%BC%9Cb%EF%BC%9Cc%2Cc-b%E5%B0%8F%E4%BA%8E%E5%B9%B6%E7%AD%89%E4%BA%8E6%2C%E9%82%A3%E4%B9%88%E6%BB%A1%E8%B6%B3%E6%9D%A1%E4%BB%B6%E7%9A%84%E5%AD%90%E9%9B%86A%E7%9A%84%E4%B8%AA%E6%95%B0%E4%B8%BA%E5%A4%9A%E5%B0%91.)
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