已知集合A={x丨x²+4x=0}B={x丨x²+2(a+1)x+a²-1=0} 问(1)若A∩B=B 求a取值范围(2)若A∪B=B求a的值!
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![已知集合A={x丨x²+4x=0}B={x丨x²+2(a+1)x+a²-1=0} 问(1)若A∩B=B 求a取值范围(2)若A∪B=B求a的值!](/uploads/image/z/10011130-34-0.jpg?t=%E5%B7%B2%E7%9F%A5%E9%9B%86%E5%90%88A%3D%EF%BD%9Bx%E4%B8%A8x%26%23178%3B%2B4x%3D0%EF%BD%9DB%3D%EF%BD%9Bx%E4%B8%A8x%26%23178%3B%2B2%28a%2B1%29x%2Ba%26%23178%3B-1%3D0%EF%BD%9D+%E9%97%AE%EF%BC%881%EF%BC%89%E8%8B%A5A%E2%88%A9B%3DB+%E6%B1%82a%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%EF%BC%882%EF%BC%89%E8%8B%A5A%E2%88%AAB%3DB%E6%B1%82a%E7%9A%84%E5%80%BC%21)
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