如图,抛物线y=ax2+bx+3与x轴相交于点A(-1,0)、B(3,0),与y轴相交于点C,点P为线段OB上的动点(不与O、B重合),过点P垂直于x轴的直线与抛物线及线段BC分别交于点E、F,点D在y轴正半轴上,OD=2,连接
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![如图,抛物线y=ax2+bx+3与x轴相交于点A(-1,0)、B(3,0),与y轴相交于点C,点P为线段OB上的动点(不与O、B重合),过点P垂直于x轴的直线与抛物线及线段BC分别交于点E、F,点D在y轴正半轴上,OD=2,连接](/uploads/image/z/6972126-6-6.jpg?t=%E5%A6%82%E5%9B%BE%2C%E6%8A%9B%E7%89%A9%E7%BA%BFy%3Dax2%2Bbx%2B3%E4%B8%8Ex%E8%BD%B4%E7%9B%B8%E4%BA%A4%E4%BA%8E%E7%82%B9A%EF%BC%88-1%2C0%EF%BC%89%E3%80%81B%EF%BC%883%2C0%EF%BC%89%2C%E4%B8%8Ey%E8%BD%B4%E7%9B%B8%E4%BA%A4%E4%BA%8E%E7%82%B9C%2C%E7%82%B9P%E4%B8%BA%E7%BA%BF%E6%AE%B5OB%E4%B8%8A%E7%9A%84%E5%8A%A8%E7%82%B9%EF%BC%88%E4%B8%8D%E4%B8%8EO%E3%80%81B%E9%87%8D%E5%90%88%EF%BC%89%2C%E8%BF%87%E7%82%B9P%E5%9E%82%E7%9B%B4%E4%BA%8Ex%E8%BD%B4%E7%9A%84%E7%9B%B4%E7%BA%BF%E4%B8%8E%E6%8A%9B%E7%89%A9%E7%BA%BF%E5%8F%8A%E7%BA%BF%E6%AE%B5BC%E5%88%86%E5%88%AB%E4%BA%A4%E4%BA%8E%E7%82%B9E%E3%80%81F%2C%E7%82%B9D%E5%9C%A8y%E8%BD%B4%E6%AD%A3%E5%8D%8A%E8%BD%B4%E4%B8%8A%2COD%3D2%2C%E8%BF%9E%E6%8E%A5)
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