对于集合A,B,我们把集合{(a,b)|a属于A,b属于B}记作A乘B.例如A={1,2},B={3,4},则有:A乘B={(1,3),(1,4),(2,3),(2,4)};B乘A={(3,10),(3,2),(4,1),(4,2)};A乘A={(1,1),(1,2),(2,1),(2,2)};B乘B={(3,3),
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![对于集合A,B,我们把集合{(a,b)|a属于A,b属于B}记作A乘B.例如A={1,2},B={3,4},则有:A乘B={(1,3),(1,4),(2,3),(2,4)};B乘A={(3,10),(3,2),(4,1),(4,2)};A乘A={(1,1),(1,2),(2,1),(2,2)};B乘B={(3,3),](/uploads/image/z/10228493-29-3.jpg?t=%E5%AF%B9%E4%BA%8E%E9%9B%86%E5%90%88A%2CB%2C%E6%88%91%E4%BB%AC%E6%8A%8A%E9%9B%86%E5%90%88%EF%BD%9B%EF%BC%88a%2Cb%EF%BC%89%7Ca%E5%B1%9E%E4%BA%8EA%2Cb%E5%B1%9E%E4%BA%8EB%EF%BD%9D%E8%AE%B0%E4%BD%9CA%E4%B9%98B.%E4%BE%8B%E5%A6%82A%3D%EF%BD%9B1%2C2%EF%BD%9D%2CB%3D%EF%BD%9B3%2C4%EF%BD%9D%2C%E5%88%99%E6%9C%89%EF%BC%9AA%E4%B9%98B%3D%7B%281%2C3%29%2C%281%2C4%29%2C%282%2C3%29%2C%282%2C4%29%7D%3BB%E4%B9%98A%3D%7B%283%2C10%EF%BC%89%2C%283%2C2%29%2C%284%2C1%29%2C%284%2C2%29%7D%3BA%E4%B9%98A%3D%7B%281%2C1%29%2C%EF%BC%881%2C2%EF%BC%89%2C%EF%BC%882%2C1%EF%BC%89%2C%EF%BC%882%2C2%EF%BC%89%EF%BD%9D%EF%BC%9BB%E4%B9%98B%3D%EF%BD%9B%EF%BC%883%2C3%EF%BC%89%2C)
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