若集合A=(x,x^2-2ax+a=0,x∈R),B=(x,x^2-4x+a+5=0,x∈R)(1)若A=B=∅,求a的取值范围(2) 若A和B中至少有一个是∅,求a的取值范围(3) 若A和B中有且仅有一个是∅,求a的取值范围答得好有分
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![若集合A=(x,x^2-2ax+a=0,x∈R),B=(x,x^2-4x+a+5=0,x∈R)(1)若A=B=∅,求a的取值范围(2) 若A和B中至少有一个是∅,求a的取值范围(3) 若A和B中有且仅有一个是∅,求a的取值范围答得好有分](/uploads/image/z/14777751-39-1.jpg?t=%E8%8B%A5%E9%9B%86%E5%90%88A%3D%28x%2Cx%5E2-2ax%2Ba%3D0%2Cx%E2%88%88R%29%2CB%3D%28x%2Cx%5E2-4x%2Ba%2B5%3D0%2Cx%E2%88%88R%29%EF%BC%881%EF%BC%89%E8%8B%A5A%3DB%3D%26%238709%3B%2C%E6%B1%82a%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%EF%BC%882%EF%BC%89+%E8%8B%A5A%E5%92%8CB%E4%B8%AD%E8%87%B3%E5%B0%91%E6%9C%89%E4%B8%80%E4%B8%AA%E6%98%AF%26%238709%3B%2C%E6%B1%82a%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%EF%BC%883%EF%BC%89+%E8%8B%A5A%E5%92%8CB%E4%B8%AD%E6%9C%89%E4%B8%94%E4%BB%85%E6%9C%89%E4%B8%80%E4%B8%AA%E6%98%AF%26%238709%3B%2C%E6%B1%82a%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%E7%AD%94%E5%BE%97%E5%A5%BD%E6%9C%89%E5%88%86)
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