已知二次函数f(x)=ax²+bx+c的图像C与x轴有两个交点,他们之间的距离为6,C的对称轴方程为x=2且f(x)有最小值-9求a,b,c的值?如果f(x)不大于7,求对应x的取值范围?最好拍下来,
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![已知二次函数f(x)=ax²+bx+c的图像C与x轴有两个交点,他们之间的距离为6,C的对称轴方程为x=2且f(x)有最小值-9求a,b,c的值?如果f(x)不大于7,求对应x的取值范围?最好拍下来,](/uploads/image/z/13852117-37-7.jpg?t=%E5%B7%B2%E7%9F%A5%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0f%EF%BC%88x%EF%BC%89%3Dax%26%23178%3B%2Bbx%2Bc%E7%9A%84%E5%9B%BE%E5%83%8FC%E4%B8%8Ex%E8%BD%B4%E6%9C%89%E4%B8%A4%E4%B8%AA%E4%BA%A4%E7%82%B9%2C%E4%BB%96%E4%BB%AC%E4%B9%8B%E9%97%B4%E7%9A%84%E8%B7%9D%E7%A6%BB%E4%B8%BA6%2CC%E7%9A%84%E5%AF%B9%E7%A7%B0%E8%BD%B4%E6%96%B9%E7%A8%8B%E4%B8%BAx%3D2%E4%B8%94f%EF%BC%88x%EF%BC%89%E6%9C%89%E6%9C%80%E5%B0%8F%E5%80%BC-9%E6%B1%82a%2Cb%2Cc%E7%9A%84%E5%80%BC%3F%E5%A6%82%E6%9E%9Cf%EF%BC%88x%EF%BC%89%E4%B8%8D%E5%A4%A7%E4%BA%8E7%2C%E6%B1%82%E5%AF%B9%E5%BA%94x%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%3F%E6%9C%80%E5%A5%BD%E6%8B%8D%E4%B8%8B%E6%9D%A5%2C)
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