解答题-问答题 较易0.85 引用1 组卷631
图1是抛物线型拱桥,当水面在
时,拱顶离水面2米,水面宽4米,
(1)建立如下图2所示的直角坐标系,求抛物线的解析式.
(2)水面下降1米后,水面宽是多少?
![](https://img.xkw.com/dksih/QBM/2011/2/22/1570005935734784/1570005940797440/STEM/246a86c18b6246b1bf741a8d1c025fcc.png?resizew=344)
![](https://img.xkw.com/dksih/QBM/2011/2/22/1570005935734784/1570005940797440/STEM/ff0e40cc6ad24299a2c861418c0c0da3.png?resizew=9)
(1)建立如下图2所示的直角坐标系,求抛物线的解析式.
(2)水面下降1米后,水面宽是多少?
![](https://img.xkw.com/dksih/QBM/2011/2/22/1570005935734784/1570005940797440/STEM/246a86c18b6246b1bf741a8d1c025fcc.png?resizew=344)
11-12高二上·湖南长沙·期末
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