原题:小船航行时有2条路线,一条船头指向上游,一条指向下游,2条航线与垂直于河对岸的航线的夹角相同,那么它们渡河所用的时间相等吗?觉得相等的给出推导过程,我知道第2名的专家也认为
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![原题:小船航行时有2条路线,一条船头指向上游,一条指向下游,2条航线与垂直于河对岸的航线的夹角相同,那么它们渡河所用的时间相等吗?觉得相等的给出推导过程,我知道第2名的专家也认为](/uploads/image/z/8585939-11-9.jpg?t=%E5%8E%9F%E9%A2%98%EF%BC%9A%E5%B0%8F%E8%88%B9%E8%88%AA%E8%A1%8C%E6%97%B6%E6%9C%892%E6%9D%A1%E8%B7%AF%E7%BA%BF%2C%E4%B8%80%E6%9D%A1%E8%88%B9%E5%A4%B4%E6%8C%87%E5%90%91%E4%B8%8A%E6%B8%B8%2C%E4%B8%80%E6%9D%A1%E6%8C%87%E5%90%91%E4%B8%8B%E6%B8%B8%2C2%E6%9D%A1%E8%88%AA%E7%BA%BF%E4%B8%8E%E5%9E%82%E7%9B%B4%E4%BA%8E%E6%B2%B3%E5%AF%B9%E5%B2%B8%E7%9A%84%E8%88%AA%E7%BA%BF%E7%9A%84%E5%A4%B9%E8%A7%92%E7%9B%B8%E5%90%8C%2C%E9%82%A3%E4%B9%88%E5%AE%83%E4%BB%AC%E6%B8%A1%E6%B2%B3%E6%89%80%E7%94%A8%E7%9A%84%E6%97%B6%E9%97%B4%E7%9B%B8%E7%AD%89%E5%90%97%3F%E8%A7%89%E5%BE%97%E7%9B%B8%E7%AD%89%E7%9A%84%E7%BB%99%E5%87%BA%E6%8E%A8%E5%AF%BC%E8%BF%87%E7%A8%8B%2C%E6%88%91%E7%9F%A5%E9%81%93%E7%AC%AC2%E5%90%8D%E7%9A%84%E4%B8%93%E5%AE%B6%E4%B9%9F%E8%AE%A4%E4%B8%BA)
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