已知全集U={-4,-3,-2,-1,0,1,2,3,4},集合A={-3,a的平方,.已知全集U={-4,-3,-2,-1,0,1,2,3,4},集合A={-3,a的平方,a+1},B={a-3,2a-1,a的平方+1},其中a属于R,若A交B={-3},求Cu(A并B)求过程...
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![已知全集U={-4,-3,-2,-1,0,1,2,3,4},集合A={-3,a的平方,.已知全集U={-4,-3,-2,-1,0,1,2,3,4},集合A={-3,a的平方,a+1},B={a-3,2a-1,a的平方+1},其中a属于R,若A交B={-3},求Cu(A并B)求过程...](/uploads/image/z/12633821-53-1.jpg?t=%E5%B7%B2%E7%9F%A5%E5%85%A8%E9%9B%86U%3D%7B-4%2C-3%2C-2%2C-1%2C0%2C1%2C2%2C3%2C4%7D%2C%E9%9B%86%E5%90%88A%3D%7B-3%2Ca%E7%9A%84%E5%B9%B3%E6%96%B9%2C.%E5%B7%B2%E7%9F%A5%E5%85%A8%E9%9B%86U%3D%7B-4%2C-3%2C-2%2C-1%2C0%2C1%2C2%2C3%2C4%7D%2C%E9%9B%86%E5%90%88A%3D%7B-3%2Ca%E7%9A%84%E5%B9%B3%E6%96%B9%2Ca%2B1%7D%2CB%3D%7Ba-3%2C2a-1%2Ca%E7%9A%84%E5%B9%B3%E6%96%B9%2B1%7D%2C%E5%85%B6%E4%B8%ADa%E5%B1%9E%E4%BA%8ER%2C%E8%8B%A5A%E4%BA%A4B%3D%7B-3%7D%2C%E6%B1%82Cu%28A%E5%B9%B6B%EF%BC%89%E6%B1%82%E8%BF%87%E7%A8%8B...)
已知全集U={-4,-3,-2,-1,0,1,2,3,4},集合A={-3,a的平方,.已知全集U={-4,-3,-2,-1,0,1,2,3,4},集合A={-3,a的平方,a+1},B={a-3,2a-1,a的平方+1},其中a属于R,若A交B={-3},求Cu(A并B)求过程...
已知全集U={-4,-3,-2,-1,0,1,2,3,4},集合A={-3,a的平方,.
已知全集U={-4,-3,-2,-1,0,1,2,3,4},集合A={-3,a的平方,a+1},B={a-3,2a-1,a的平方+1},其中a属于R,若A交B={-3},求Cu(A并B)
求过程...
已知全集U={-4,-3,-2,-1,0,1,2,3,4},集合A={-3,a的平方,.已知全集U={-4,-3,-2,-1,0,1,2,3,4},集合A={-3,a的平方,a+1},B={a-3,2a-1,a的平方+1},其中a属于R,若A交B={-3},求Cu(A并B)求过程...
若A交B={-3},
(1) if a-3=-3, then a=0,A={-3,0,1} B={-3,-1,1} A交B={-3,1},Error!
(2) if 2a-1=-3,then a=-1,A={-3,1,0} B={-4,-3,2} Right
so Cu(A并B)={-1,-2,3,4}
(3) ifa*a+1=-3, Error!
so the answer is {-1,-2,3,4}
A交B={-3}
得A=-1
Cu(A并B)=-2 -1 2 3 4
2
A={-3,a的平方,a+1},B={a-3,2a-1,a的平方+1}
说明a-3,2a-1里面有一个=-3
a-3=-3.a=0
A={-3,0,1},B={-3,-1,1}
那么交集还有一个1,所以不对
只能2a-1=-3,a=-1
A={-3,1,0},B={-4,-3,2}这样就对了
(A并B)={-4,-3,0,1,2}
Cu(A并B) ={-2,-1,3,4}
可以将-3代人集合A或B中,因为A和B集合中必有-3
慢慢的将数字代人,最后结果是{-1,-2,3,4}
若A交B={-3},
(1) if a-3=-3, then a=0,A={-3,0,1} B={-3,-1,1} A交B={-3,1},Error!
(2) if 2a-1=-3,then a=-1,A={-3,1,0} B={-4,-3,2}
全部展开
可以将-3代人集合A或B中,因为A和B集合中必有-3
慢慢的将数字代人,最后结果是{-1,-2,3,4}
若A交B={-3},
(1) if a-3=-3, then a=0,A={-3,0,1} B={-3,-1,1} A交B={-3,1},Error!
(2) if 2a-1=-3,then a=-1,A={-3,1,0} B={-4,-3,2}
Cu(A并B)={-1,-2,3,4}
(3) ifa*a+1=-3
结果{-1,-2,3,4}
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