已知集合A={x|-2≤x≤a},B={y|y=2x+3,x€A},C={z|z=x^2,x€A}且c含于B,求a的取值范围
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![已知集合A={x|-2≤x≤a},B={y|y=2x+3,x€A},C={z|z=x^2,x€A}且c含于B,求a的取值范围](/uploads/image/z/13287564-36-4.jpg?t=%E5%B7%B2%E7%9F%A5%E9%9B%86%E5%90%88A%3D%EF%BD%9Bx%7C-2%E2%89%A4x%E2%89%A4a%7D%2CB%3D%EF%BD%9By%7Cy%3D2x%2B3%2Cx%26%238364%3BA%EF%BD%9D%2CC%3D%EF%BD%9Bz%7Cz%3Dx%5E2%2Cx%26%238364%3BA%EF%BD%9D%E4%B8%94c%E5%90%AB%E4%BA%8EB%2C%E6%B1%82a%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4)
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