已知抛物线型拱桥的顶点距水面2米,测量水面宽度为8米.当水面上升1

已知抛物线型拱桥的顶点距水面2,测量水面宽度为8.当水面上升1,水面宽度为              . (精确到0.1)

答案

5.7 

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