设A={x|x^2-ax+a^2-19} B={x|x^2-5x+6=0}C={x|x^2+2x-8=0}(1)若A∩B=A∪B,求a的值(2)若A∩B≠空集 A∪C=空集,求a的值(3)若A∩B=A∩C≠空集,求a的值
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![设A={x|x^2-ax+a^2-19} B={x|x^2-5x+6=0}C={x|x^2+2x-8=0}(1)若A∩B=A∪B,求a的值(2)若A∩B≠空集 A∪C=空集,求a的值(3)若A∩B=A∩C≠空集,求a的值](/uploads/image/z/583253-53-3.jpg?t=%E8%AE%BEA%3D%7Bx%7Cx%5E2-ax%2Ba%5E2-19%7D+B%3D%7Bx%7Cx%5E2-5x%2B6%3D0%7DC%3D%7Bx%7Cx%5E2%2B2x-8%3D0%7D%281%29%E8%8B%A5A%E2%88%A9B%3DA%E2%88%AAB%2C%E6%B1%82a%E7%9A%84%E5%80%BC%EF%BC%882%EF%BC%89%E8%8B%A5A%E2%88%A9B%E2%89%A0%E7%A9%BA%E9%9B%86+A%E2%88%AAC%3D%E7%A9%BA%E9%9B%86%2C%E6%B1%82a%E7%9A%84%E5%80%BC%EF%BC%883%EF%BC%89%E8%8B%A5A%E2%88%A9B%3DA%E2%88%A9C%E2%89%A0%E7%A9%BA%E9%9B%86%2C%E6%B1%82a%E7%9A%84%E5%80%BC)
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