该题选C,为什么?若集合A={1,3,x},B={x2,1},且集合B属于集合A,则满足条件的实数x有( )A.1个 B.2个 C.3个 D.4个(“2”是平方的意思)
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![该题选C,为什么?若集合A={1,3,x},B={x2,1},且集合B属于集合A,则满足条件的实数x有( )A.1个 B.2个 C.3个 D.4个(“2”是平方的意思)](/uploads/image/z/3109127-23-7.jpg?t=%E8%AF%A5%E9%A2%98%E9%80%89C%2C%E4%B8%BA%E4%BB%80%E4%B9%88%3F%E8%8B%A5%E9%9B%86%E5%90%88A%3D%7B1%2C3%2Cx%7D%2CB%3D%7Bx2%2C1%7D%2C%E4%B8%94%E9%9B%86%E5%90%88B%E5%B1%9E%E4%BA%8E%E9%9B%86%E5%90%88A%2C%E5%88%99%E6%BB%A1%E8%B6%B3%E6%9D%A1%E4%BB%B6%E7%9A%84%E5%AE%9E%E6%95%B0x%E6%9C%89%EF%BC%88+%EF%BC%89A.1%E4%B8%AA+B.2%E4%B8%AA+C.3%E4%B8%AA+D.4%E4%B8%AA%EF%BC%88%E2%80%9C2%E2%80%9D%E6%98%AF%E5%B9%B3%E6%96%B9%E7%9A%84%E6%84%8F%E6%80%9D%EF%BC%89)
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