如图1,已知直线y=x+3与x轴交于点A,与y轴交于点B,抛物线y=-x2+bx+c经过A、B两点,与x轴交于另一个点C,对称轴与直线AB交于点E,抛物线顶点为D.(1)求抛物线的解析式;(2)在第三象限内,F为抛物
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![如图1,已知直线y=x+3与x轴交于点A,与y轴交于点B,抛物线y=-x2+bx+c经过A、B两点,与x轴交于另一个点C,对称轴与直线AB交于点E,抛物线顶点为D.(1)求抛物线的解析式;(2)在第三象限内,F为抛物](/uploads/image/z/1023402-66-2.jpg?t=%E5%A6%82%E5%9B%BE1%2C%E5%B7%B2%E7%9F%A5%E7%9B%B4%E7%BA%BFy%3Dx%2B3%E4%B8%8Ex%E8%BD%B4%E4%BA%A4%E4%BA%8E%E7%82%B9A%2C%E4%B8%8Ey%E8%BD%B4%E4%BA%A4%E4%BA%8E%E7%82%B9B%2C%E6%8A%9B%E7%89%A9%E7%BA%BFy%3D-x2%2Bbx%2Bc%E7%BB%8F%E8%BF%87A%E3%80%81B%E4%B8%A4%E7%82%B9%2C%E4%B8%8Ex%E8%BD%B4%E4%BA%A4%E4%BA%8E%E5%8F%A6%E4%B8%80%E4%B8%AA%E7%82%B9C%2C%E5%AF%B9%E7%A7%B0%E8%BD%B4%E4%B8%8E%E7%9B%B4%E7%BA%BFAB%E4%BA%A4%E4%BA%8E%E7%82%B9E%2C%E6%8A%9B%E7%89%A9%E7%BA%BF%E9%A1%B6%E7%82%B9%E4%B8%BAD%EF%BC%8E%EF%BC%881%EF%BC%89%E6%B1%82%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%9A%84%E8%A7%A3%E6%9E%90%E5%BC%8F%EF%BC%9B%EF%BC%882%EF%BC%89%E5%9C%A8%E7%AC%AC%E4%B8%89%E8%B1%A1%E9%99%90%E5%86%85%2CF%E4%B8%BA%E6%8A%9B%E7%89%A9)
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