设集合p={3.4.5},q={4.5.6.7}定义,p*q={(a,b)|a∈p,b∈q}求p*q的非空真子集的个数(3,4)(3,5)(3,6)(3,7) (4,4)(4,5)(4,6)(4,7) (5,4)(5,5)(5,6)(5,7) 1.(4,4)(5,5) 也可以么 不是必须不同的么
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![设集合p={3.4.5},q={4.5.6.7}定义,p*q={(a,b)|a∈p,b∈q}求p*q的非空真子集的个数(3,4)(3,5)(3,6)(3,7) (4,4)(4,5)(4,6)(4,7) (5,4)(5,5)(5,6)(5,7) 1.(4,4)(5,5) 也可以么 不是必须不同的么](/uploads/image/z/6125441-41-1.jpg?t=%E8%AE%BE%E9%9B%86%E5%90%88p%EF%BC%9D%EF%BD%9B3.4.5%EF%BD%9D%2Cq%EF%BC%9D%EF%BD%9B4.5.6.7%EF%BD%9D%E5%AE%9A%E4%B9%89%2Cp%2Aq%EF%BC%9D%EF%BD%9B%EF%BC%88a%2Cb%EF%BC%89%7Ca%E2%88%88p%2Cb%E2%88%88q%EF%BD%9D%E6%B1%82p%2Aq%E7%9A%84%E9%9D%9E%E7%A9%BA%E7%9C%9F%E5%AD%90%E9%9B%86%E7%9A%84%E4%B8%AA%E6%95%B0%283%2C4%29%283%2C5%29%283%2C6%29%283%2C7%29+%284%2C4%29%284%2C5%29%284%2C6%29%284%2C7%29+%285%2C4%29%285%2C5%29%285%2C6%29%285%2C7%29+1.%EF%BC%884%2C4%EF%BC%89%EF%BC%885%2C5%EF%BC%89+%E4%B9%9F%E5%8F%AF%E4%BB%A5%E4%B9%88+%E4%B8%8D%E6%98%AF%E5%BF%85%E9%A1%BB%E4%B8%8D%E5%90%8C%E7%9A%84%E4%B9%88)
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