设集合A={y|y=x²-2x-3},B={y|y=-x²-2x-3},求A交B,A并B
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![设集合A={y|y=x²-2x-3},B={y|y=-x²-2x-3},求A交B,A并B](/uploads/image/z/3879569-65-9.jpg?t=%E8%AE%BE%E9%9B%86%E5%90%88A%3D%EF%BD%9By%7Cy%3Dx%26%23178%3B-2x-3%EF%BD%9D%2CB%3D%EF%BD%9By%7Cy%3D-x%26%23178%3B-2x-3%EF%BD%9D%2C%E6%B1%82A%E4%BA%A4B%2CA%E5%B9%B6B)
设集合A={y|y=x²-2x-3},B={y|y=-x²-2x-3},求A交B,A并B
设集合A={y|y=x²-2x-3},B={y|y=-x²-2x-3},求A交B,A并B
设集合A={y|y=x²-2x-3},B={y|y=-x²-2x-3},求A交B,A并B
A={y|y=x²-2x-3},
y=(x-1)²-4≥-4
A=[-4,+∞)
B={y|y=-x²-2x-3}
y=-(x+1)²-2≤-2
B=(-∞,-2]
所以
A∩B=[-4,-2]
A∪B=R