已知集合A={x|-2≦x≦a},B={z|z=2x+3,x∈A},C={z|z=x²,x∈A},且C属于B,a的取值范围.答案是½≦x≦3
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![已知集合A={x|-2≦x≦a},B={z|z=2x+3,x∈A},C={z|z=x²,x∈A},且C属于B,a的取值范围.答案是½≦x≦3](/uploads/image/z/5304685-13-5.jpg?t=%E5%B7%B2%E7%9F%A5%E9%9B%86%E5%90%88A%3D%7Bx%7C-2%E2%89%A6x%E2%89%A6a%7D%2CB%3D%7Bz%7Cz%3D2x%2B3%2Cx%E2%88%88A%7D%2CC%3D%7Bz%7Cz%3Dx%26%23178%3B%2Cx%E2%88%88A%7D%2C%E4%B8%94C%E5%B1%9E%E4%BA%8EB%2Ca%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4.%E7%AD%94%E6%A1%88%E6%98%AF%26%23189%3B%E2%89%A6x%E2%89%A63)
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