(2012•孝感)如图,抛物线y=ax2+bx+c(a,b,c是常数,a≠0)与x轴交于A,B两点,与y轴交于点C,三个交点的坐标分别为A(-1,0),B(3,0),C(0,3).(1)求抛物线的解析式及顶点D的坐标;(2)若P为
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![(2012•孝感)如图,抛物线y=ax2+bx+c(a,b,c是常数,a≠0)与x轴交于A,B两点,与y轴交于点C,三个交点的坐标分别为A(-1,0),B(3,0),C(0,3).(1)求抛物线的解析式及顶点D的坐标;(2)若P为](/uploads/image/z/2000096-8-6.jpg?t=%EF%BC%882012%26%238226%3B%E5%AD%9D%E6%84%9F%EF%BC%89%E5%A6%82%E5%9B%BE%2C%E6%8A%9B%E7%89%A9%E7%BA%BFy%3Dax2%2Bbx%2Bc%EF%BC%88a%2Cb%2Cc%E6%98%AF%E5%B8%B8%E6%95%B0%2Ca%E2%89%A00%EF%BC%89%E4%B8%8Ex%E8%BD%B4%E4%BA%A4%E4%BA%8EA%2CB%E4%B8%A4%E7%82%B9%2C%E4%B8%8Ey%E8%BD%B4%E4%BA%A4%E4%BA%8E%E7%82%B9C%2C%E4%B8%89%E4%B8%AA%E4%BA%A4%E7%82%B9%E7%9A%84%E5%9D%90%E6%A0%87%E5%88%86%E5%88%AB%E4%B8%BAA%EF%BC%88-1%2C0%EF%BC%89%2CB%EF%BC%883%2C0%EF%BC%89%2CC%EF%BC%880%2C3%EF%BC%89%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%E5%8F%8A%E9%A1%B6%E7%82%B9D%E7%9A%84%E5%9D%90%E6%A0%87%EF%BC%9B%EF%BC%882%EF%BC%89%E8%8B%A5P%E4%B8%BA)
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