如图,已知抛物线y=-4/9x²+bx+c与x轴相交于A、B两点,其对称轴为直线x=2,且与x轴交于点D,AO=1(2)若线段BC的垂直平分线EF交BC于点E,交x轴于点F.求FC的长(3)探究:在抛物线的对称轴上是否存在
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![如图,已知抛物线y=-4/9x²+bx+c与x轴相交于A、B两点,其对称轴为直线x=2,且与x轴交于点D,AO=1(2)若线段BC的垂直平分线EF交BC于点E,交x轴于点F.求FC的长(3)探究:在抛物线的对称轴上是否存在](/uploads/image/z/805109-5-9.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%B7%B2%E7%9F%A5%E6%8A%9B%E7%89%A9%E7%BA%BFy%3D-4%2F9x%26%23178%3B%2Bbx%2Bc%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%E5%AF%B9%E7%A7%B0%E8%BD%B4%E4%B8%BA%E7%9B%B4%E7%BA%BFx%3D2%2C%E4%B8%94%E4%B8%8Ex%E8%BD%B4%E4%BA%A4%E4%BA%8E%E7%82%B9D%2CAO%3D1%EF%BC%882%EF%BC%89%E8%8B%A5%E7%BA%BF%E6%AE%B5BC%E7%9A%84%E5%9E%82%E7%9B%B4%E5%B9%B3%E5%88%86%E7%BA%BFEF%E4%BA%A4BC%E4%BA%8E%E7%82%B9E%2C%E4%BA%A4x%E8%BD%B4%E4%BA%8E%E7%82%B9F.%E6%B1%82FC%E7%9A%84%E9%95%BF%EF%BC%883%EF%BC%89%E6%8E%A2%E7%A9%B6%EF%BC%9A%E5%9C%A8%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%9A%84%E5%AF%B9%E7%A7%B0%E8%BD%B4%E4%B8%8A%E6%98%AF%E5%90%A6%E5%AD%98%E5%9C%A8)
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