设集合A={(x,y)│x=a,y∈R},B={(x,y)│x^2/4+y^2=1},A∩B=∅,则实数a的
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设集合A={(x,y)│x=a,y∈R},B={(x,y)│x^2/4+y^2=1},A∩B=∅,则实数a的取值范围
![设集合A={(x,y)│x=a,y∈R},B={(x,y)│x^2/4+y^2=1},A∩B=∅,则实数a的](/uploads/image/z/18516397-13-7.jpg?t=%E8%AE%BE%E9%9B%86%E5%90%88A%3D%7B%28x%2Cy%29%E2%94%82x%3Da%2Cy%E2%88%88R%7D%2CB%3D%7B%28x%2Cy%29%E2%94%82x%5E2%2F4%2By%5E2%3D1%7D%2CA%E2%88%A9B%3D%26%238709%3B%2C%E5%88%99%E5%AE%9E%E6%95%B0a%E7%9A%84)
根据B,可知 -2
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