如图,已知二次函数y=ax2+4x+c的图象经过点A(1,-1)和点B(-3,-9). (1)求该二次函数的表达式; (2如图,已知二次函数y=ax2+4x+c的图象经过点A(1,-1)和点B(-3,-9).(1)求该二次函数的表达
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![如图,已知二次函数y=ax2+4x+c的图象经过点A(1,-1)和点B(-3,-9). (1)求该二次函数的表达式; (2如图,已知二次函数y=ax2+4x+c的图象经过点A(1,-1)和点B(-3,-9).(1)求该二次函数的表达](/uploads/image/z/1013011-43-1.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%B7%B2%E7%9F%A5%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0y%3Dax2%2B4x%2Bc%E7%9A%84%E5%9B%BE%E8%B1%A1%E7%BB%8F%E8%BF%87%E7%82%B9A%EF%BC%881%2C-1%EF%BC%89%E5%92%8C%E7%82%B9B%EF%BC%88-3%2C-9%EF%BC%89%EF%BC%8E+%EF%BC%881%EF%BC%89%E6%B1%82%E8%AF%A5%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0%E7%9A%84%E8%A1%A8%E8%BE%BE%E5%BC%8F%EF%BC%9B+%EF%BC%882%E5%A6%82%E5%9B%BE%2C%E5%B7%B2%E7%9F%A5%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0y%3Dax2%2B4x%2Bc%E7%9A%84%E5%9B%BE%E8%B1%A1%E7%BB%8F%E8%BF%87%E7%82%B9A%EF%BC%881%2C-1%EF%BC%89%E5%92%8C%E7%82%B9B%EF%BC%88-3%2C-9%EF%BC%89%EF%BC%8E%EF%BC%881%EF%BC%89%E6%B1%82%E8%AF%A5%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0%E7%9A%84%E8%A1%A8%E8%BE%BE)
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