设A=﹛x |x²+4x=0﹜,B=﹛x |x²+2(a+1)x+a²-1=0﹜,其中x∈R,如果A∩B=B,求实数a的取值范围.如果A=﹛x |ax²+3x+2=0﹜是单元素集合,求实数a的取值集合。
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![设A=﹛x |x²+4x=0﹜,B=﹛x |x²+2(a+1)x+a²-1=0﹜,其中x∈R,如果A∩B=B,求实数a的取值范围.如果A=﹛x |ax²+3x+2=0﹜是单元素集合,求实数a的取值集合。](/uploads/image/z/3997912-40-2.jpg?t=%E8%AE%BEA%3D%EF%B9%9Bx+%7Cx%26%23178%3B%2B4x%3D0%EF%B9%9C%2CB%3D%EF%B9%9Bx+%7Cx%26%23178%3B%2B2%28a%2B1%29x%2Ba%26%23178%3B-1%3D0%EF%B9%9C%2C%E5%85%B6%E4%B8%ADx%E2%88%88R%2C%E5%A6%82%E6%9E%9CA%E2%88%A9B%3DB%2C%E6%B1%82%E5%AE%9E%E6%95%B0a%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4.%E5%A6%82%E6%9E%9CA%3D%EF%B9%9Bx+%7Cax%26%23178%3B%2B3x%2B2%3D0%EF%B9%9C%E6%98%AF%E5%8D%95%E5%85%83%E7%B4%A0%E9%9B%86%E5%90%88%EF%BC%8C%E6%B1%82%E5%AE%9E%E6%95%B0a%E7%9A%84%E5%8F%96%E5%80%BC%E9%9B%86%E5%90%88%E3%80%82)
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