在直角坐标系xOy中已知二次函数y=ax^2+bx+c的图像与x轴交于AB两点与y轴交于点C其顶点的横坐标为1且过(2,3)和(-3,-12)(1)求此二次函数表达式.(2)若直线l:y=kx与线段BC交于点D(不与点B,C重合
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![在直角坐标系xOy中已知二次函数y=ax^2+bx+c的图像与x轴交于AB两点与y轴交于点C其顶点的横坐标为1且过(2,3)和(-3,-12)(1)求此二次函数表达式.(2)若直线l:y=kx与线段BC交于点D(不与点B,C重合](/uploads/image/z/12566124-36-4.jpg?t=%E5%9C%A8%E7%9B%B4%E8%A7%92%E5%9D%90%E6%A0%87%E7%B3%BBxOy%E4%B8%AD%E5%B7%B2%E7%9F%A5%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0y%3Dax%5E2%2Bbx%2Bc%E7%9A%84%E5%9B%BE%E5%83%8F%E4%B8%8Ex%E8%BD%B4%E4%BA%A4%E4%BA%8EAB%E4%B8%A4%E7%82%B9%E4%B8%8Ey%E8%BD%B4%E4%BA%A4%E4%BA%8E%E7%82%B9C%E5%85%B6%E9%A1%B6%E7%82%B9%E7%9A%84%E6%A8%AA%E5%9D%90%E6%A0%87%E4%B8%BA1%E4%B8%94%E8%BF%87%282%2C3%29%E5%92%8C%EF%BC%88-3%2C-12%EF%BC%89%EF%BC%881%EF%BC%89%E6%B1%82%E6%AD%A4%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0%E8%A1%A8%E8%BE%BE%E5%BC%8F.%EF%BC%882%EF%BC%89%E8%8B%A5%E7%9B%B4%E7%BA%BFl%3Ay%3Dkx%E4%B8%8E%E7%BA%BF%E6%AE%B5BC%E4%BA%A4%E4%BA%8E%E7%82%B9D%EF%BC%88%E4%B8%8D%E4%B8%8E%E7%82%B9B%2CC%E9%87%8D%E5%90%88)
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