已知抛物线y=-2/3x2+bx+c与x轴交于不同的两点A(x1,0)和b(x2,0),与y轴交于点C,且x1、x2是方程x2-2x-3=0的两个根(x1
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![已知抛物线y=-2/3x2+bx+c与x轴交于不同的两点A(x1,0)和b(x2,0),与y轴交于点C,且x1、x2是方程x2-2x-3=0的两个根(x1](/uploads/image/z/12563317-37-7.jpg?t=%E5%B7%B2%E7%9F%A5%E6%8A%9B%E7%89%A9%E7%BA%BFy%3D-2%2F3x2%2Bbx%2Bc%E4%B8%8Ex%E8%BD%B4%E4%BA%A4%E4%BA%8E%E4%B8%8D%E5%90%8C%E7%9A%84%E4%B8%A4%E7%82%B9A%28x1%2C0%29%E5%92%8Cb%28x2%2C0%29%2C%E4%B8%8Ey%E8%BD%B4%E4%BA%A4%E4%BA%8E%E7%82%B9C%2C%E4%B8%94x1%E3%80%81x2%E6%98%AF%E6%96%B9%E7%A8%8Bx2-2x-3%3D0%E7%9A%84%E4%B8%A4%E4%B8%AA%E6%A0%B9%EF%BC%88x1)
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