若非空集合M⊆N={a,b,c,d},则M的个数为8个{a},{b},{c},{d},{a,b},{a,c},{a,d},{b,c},{b,d},{c,d},{a,c,d},{a,b,c},{a,b,d},{b,c,d},{a,b,c,d}; 不是有这么多么
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![若非空集合M⊆N={a,b,c,d},则M的个数为8个{a},{b},{c},{d},{a,b},{a,c},{a,d},{b,c},{b,d},{c,d},{a,c,d},{a,b,c},{a,b,d},{b,c,d},{a,b,c,d}; 不是有这么多么](/uploads/image/z/8734801-49-1.jpg?t=%E8%8B%A5%E9%9D%9E%E7%A9%BA%E9%9B%86%E5%90%88M%26%238838%3BN%3D%7Ba%2Cb%2Cc%2Cd%7D%2C%E5%88%99M%E7%9A%84%E4%B8%AA%E6%95%B0%E4%B8%BA8%E4%B8%AA%7Ba%7D%2C%7Bb%7D%2C%7Bc%7D%2C%7Bd%7D%2C%7Ba%2Cb%7D%2C%7Ba%2Cc%7D%2C%7Ba%2Cd%7D%2C%7Bb%2Cc%7D%2C%7Bb%2Cd%7D%2C%7Bc%2Cd%7D%2C%7Ba%2Cc%2Cd%7D%2C%7Ba%2Cb%2Cc%7D%2C%7Ba%2Cb%2Cd%7D%2C%7Bb%2Cc%2Cd%7D%2C%7Ba%2Cb%2Cc%2Cd%7D%EF%BC%9B+%E4%B8%8D%E6%98%AF%E6%9C%89%E8%BF%99%E4%B9%88%E5%A4%9A%E4%B9%88)
若非空集合M⊆N={a,b,c,d},则M的个数为8个{a},{b},{c},{d},{a,b},{a,c},{a,d},{b,c},{b,d},{c,d},{a,c,d},{a,b,c},{a,b,d},{b,c,d},{a,b,c,d}; 不是有这么多么
若非空集合M⊆N={a,b,c,d},则M的个数为8个
{a},{b},{c},{d},{a,b},{a,c},{a,d},{b,c},{b,d},{c,d},{a,c,d},{a,b,c},{a,b,d},{b,c,d},{a,b,c,d}; 不是有这么多么
若非空集合M⊆N={a,b,c,d},则M的个数为8个{a},{b},{c},{d},{a,b},{a,c},{a,d},{b,c},{b,d},{c,d},{a,c,d},{a,b,c},{a,b,d},{b,c,d},{a,b,c,d}; 不是有这么多么
你好还少一个空集呢
M是N的子集,而N中有4个元素,
故N的子集M共计16个,
你写了15个,还有一个空集没写.
注意一般情况是若集合M里有n个元素,
则M的子集有2^n个.
应该就是15个啊,要不题目本身有误,怎么是8个呢