函数y=根号下-x^+3x+18的定义域怎么求
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![函数y=根号下-x^+3x+18的定义域怎么求](/uploads/image/z/1627939-19-9.jpg?t=%E5%87%BD%E6%95%B0y%3D%E6%A0%B9%E5%8F%B7%E4%B8%8B-x%5E%2B3x%2B18%E7%9A%84%E5%AE%9A%E4%B9%89%E5%9F%9F%E6%80%8E%E4%B9%88%E6%B1%82)
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