有一座抛物线形的拱桥,桥身处在图中水位时,水面宽AB为20m,3m,就达到警戒线CD,这时的水面宽为10m.(1)在如图所示的坐标系中,求抛物线的表达式.(2)若洪水到来,水位会以每小时0.2m的速度上
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![有一座抛物线形的拱桥,桥身处在图中水位时,水面宽AB为20m,3m,就达到警戒线CD,这时的水面宽为10m.(1)在如图所示的坐标系中,求抛物线的表达式.(2)若洪水到来,水位会以每小时0.2m的速度上](/uploads/image/z/8359444-28-4.jpg?t=%E6%9C%89%E4%B8%80%E5%BA%A7%E6%8A%9B%E7%89%A9%E7%BA%BF%E5%BD%A2%E7%9A%84%E6%8B%B1%E6%A1%A5%2C%E6%A1%A5%E8%BA%AB%E5%A4%84%E5%9C%A8%E5%9B%BE%E4%B8%AD%E6%B0%B4%E4%BD%8D%E6%97%B6%2C%E6%B0%B4%E9%9D%A2%E5%AE%BDAB%E4%B8%BA20m%2C3m%2C%E5%B0%B1%E8%BE%BE%E5%88%B0%E8%AD%A6%E6%88%92%E7%BA%BFCD%2C%E8%BF%99%E6%97%B6%E7%9A%84%E6%B0%B4%E9%9D%A2%E5%AE%BD%E4%B8%BA10m.%EF%BC%881%EF%BC%89%E5%9C%A8%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%E7%9A%84%E5%9D%90%E6%A0%87%E7%B3%BB%E4%B8%AD%2C%E6%B1%82%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%9A%84%E8%A1%A8%E8%BE%BE%E5%BC%8F.%EF%BC%882%EF%BC%89%E8%8B%A5%E6%B4%AA%E6%B0%B4%E5%88%B0%E6%9D%A5%2C%E6%B0%B4%E4%BD%8D%E4%BC%9A%E4%BB%A5%E6%AF%8F%E5%B0%8F%E6%97%B60.2m%E7%9A%84%E9%80%9F%E5%BA%A6%E4%B8%8A)
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