河两岸平行宽500M,船从A到正对岸B,航速│v1│=10km/h,水流速│v2│=4km/h,1)求v1与v2夹角,垂直到对岸的时间2)要使船到对岸所用时间最少,v1与v2的夹角应为多少
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![河两岸平行宽500M,船从A到正对岸B,航速│v1│=10km/h,水流速│v2│=4km/h,1)求v1与v2夹角,垂直到对岸的时间2)要使船到对岸所用时间最少,v1与v2的夹角应为多少](/uploads/image/z/14841498-66-8.jpg?t=%E6%B2%B3%E4%B8%A4%E5%B2%B8%E5%B9%B3%E8%A1%8C%E5%AE%BD500M%2C%E8%88%B9%E4%BB%8EA%E5%88%B0%E6%AD%A3%E5%AF%B9%E5%B2%B8B%2C%E8%88%AA%E9%80%9F%E2%94%82v1%E2%94%82%3D10km%2Fh%2C%E6%B0%B4%E6%B5%81%E9%80%9F%E2%94%82v2%E2%94%82%3D4km%2Fh%2C1%EF%BC%89%E6%B1%82v1%E4%B8%8Ev2%E5%A4%B9%E8%A7%92%EF%BC%8C%E5%9E%82%E7%9B%B4%E5%88%B0%E5%AF%B9%E5%B2%B8%E7%9A%84%E6%97%B6%E9%97%B42%29%E8%A6%81%E4%BD%BF%E8%88%B9%E5%88%B0%E5%AF%B9%E5%B2%B8%E6%89%80%E7%94%A8%E6%97%B6%E9%97%B4%E6%9C%80%E5%B0%91%EF%BC%8Cv1%E4%B8%8Ev2%E7%9A%84%E5%A4%B9%E8%A7%92%E5%BA%94%E4%B8%BA%E5%A4%9A%E5%B0%91)
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