已知A={x丨丨x-a丨=4},B={1,2,b},是否存在实数a,使得对于任意实数b,都有A⊆B?A={x||x-a|=4}={a-4,a+4}B={1,2,b}要使得对于任意实数b,都有:A⊆B,则:A={1,2},得:(1)a-4=1且a+4=2,此时无解;(2
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![已知A={x丨丨x-a丨=4},B={1,2,b},是否存在实数a,使得对于任意实数b,都有A⊆B?A={x||x-a|=4}={a-4,a+4}B={1,2,b}要使得对于任意实数b,都有:A⊆B,则:A={1,2},得:(1)a-4=1且a+4=2,此时无解;(2](/uploads/image/z/15063441-33-1.jpg?t=%E5%B7%B2%E7%9F%A5A%3D%EF%BD%9Bx%E4%B8%A8%E4%B8%A8x-a%E4%B8%A8%3D4%EF%BD%9D%2CB%3D%EF%BD%9B1%2C2%2Cb%EF%BD%9D%2C%E6%98%AF%E5%90%A6%E5%AD%98%E5%9C%A8%E5%AE%9E%E6%95%B0a%2C%E4%BD%BF%E5%BE%97%E5%AF%B9%E4%BA%8E%E4%BB%BB%E6%84%8F%E5%AE%9E%E6%95%B0b%2C%E9%83%BD%E6%9C%89A%26%238838%3BB%3FA%3D%7Bx%7C%7Cx%EF%BC%8Da%7C%3D4%7D%3D%7Ba%EF%BC%8D4%2Ca%EF%BC%8B4%7DB%3D%7B1%2C2%2Cb%7D%E8%A6%81%E4%BD%BF%E5%BE%97%E5%AF%B9%E4%BA%8E%E4%BB%BB%E6%84%8F%E5%AE%9E%E6%95%B0b%2C%E9%83%BD%E6%9C%89%EF%BC%9AA%26%238838%3BB%2C%E5%88%99%EF%BC%9AA%3D%7B1%2C2%7D%2C%E5%BE%97%EF%BC%9A%281%29a%EF%BC%8D4%3D1%E4%B8%94a%EF%BC%8B4%3D2%2C%E6%AD%A4%E6%97%B6%E6%97%A0%E8%A7%A3%EF%BC%9B%282)
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