如图,对称轴为直线x=-1的抛物线y=ax2+bx+c(a≠0)与x轴相交于A、B两点,其中点A的坐标为(-3,0).(1)求点B的坐标;(2)已知a=1,C为抛物线与y轴的交点.①若点P在抛物线上,且S△POC=4S△BOC.
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![如图,对称轴为直线x=-1的抛物线y=ax2+bx+c(a≠0)与x轴相交于A、B两点,其中点A的坐标为(-3,0).(1)求点B的坐标;(2)已知a=1,C为抛物线与y轴的交点.①若点P在抛物线上,且S△POC=4S△BOC.](/uploads/image/z/805114-10-4.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%AF%B9%E7%A7%B0%E8%BD%B4%E4%B8%BA%E7%9B%B4%E7%BA%BFx%3D-1%E7%9A%84%E6%8A%9B%E7%89%A9%E7%BA%BFy%3Dax2%2Bbx%2Bc%EF%BC%88a%E2%89%A00%EF%BC%89%E4%B8%8Ex%E8%BD%B4%E7%9B%B8%E4%BA%A4%E4%BA%8EA%E3%80%81B%E4%B8%A4%E7%82%B9%2C%E5%85%B6%E4%B8%AD%E7%82%B9A%E7%9A%84%E5%9D%90%E6%A0%87%E4%B8%BA%EF%BC%88-3%2C0%EF%BC%89%EF%BC%8E%EF%BC%881%EF%BC%89%E6%B1%82%E7%82%B9B%E7%9A%84%E5%9D%90%E6%A0%87%EF%BC%9B%EF%BC%882%EF%BC%89%E5%B7%B2%E7%9F%A5a%3D1%2CC%E4%B8%BA%E6%8A%9B%E7%89%A9%E7%BA%BF%E4%B8%8Ey%E8%BD%B4%E7%9A%84%E4%BA%A4%E7%82%B9%EF%BC%8E%E2%91%A0%E8%8B%A5%E7%82%B9P%E5%9C%A8%E6%8A%9B%E7%89%A9%E7%BA%BF%E4%B8%8A%2C%E4%B8%94S%E2%96%B3POC%3D4S%E2%96%B3BOC%EF%BC%8E)
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