抛物线y=ax2+bx+c的顶点为C(1,4),交x轴于点A(3,0),交y轴于点D.求直线AD的表达式A(3,0) B(-2,0) C(1,4) D(0,c) a<0 b>0 c>0 对称轴:直线x=1
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![抛物线y=ax2+bx+c的顶点为C(1,4),交x轴于点A(3,0),交y轴于点D.求直线AD的表达式A(3,0) B(-2,0) C(1,4) D(0,c) a<0 b>0 c>0 对称轴:直线x=1](/uploads/image/z/6080419-19-9.jpg?t=%E6%8A%9B%E7%89%A9%E7%BA%BFy%3Dax2%2Bbx%2Bc%E7%9A%84%E9%A1%B6%E7%82%B9%E4%B8%BAC%281%2C4%29%2C%E4%BA%A4x%E8%BD%B4%E4%BA%8E%E7%82%B9A%283%2C0%EF%BC%89%2C%E4%BA%A4y%E8%BD%B4%E4%BA%8E%E7%82%B9D.%E6%B1%82%E7%9B%B4%E7%BA%BFAD%E7%9A%84%E8%A1%A8%E8%BE%BE%E5%BC%8FA%283%2C0%29+B%28-2%2C0%29+C%281%2C4%29+D%280%2Cc%EF%BC%89+a%EF%BC%9C0+b%EF%BC%9E0+c%EF%BC%9E0+%E5%AF%B9%E7%A7%B0%E8%BD%B4%EF%BC%9A%E7%9B%B4%E7%BA%BFx%3D1)
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