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一、过河时间最短例1 已知小船在静水中的运动速度为v1,某条河的宽度为L,河水的流速处处相等且大小为v2,小船怎样过河,过河时间最短?
First, the shortest crossing time Example 1 The speed of the boat in still water is known to be v1. The width of a river is L. The flow rate of the river is equal everywhere and its size is v2. How does the boat cross the river and the shortest time of crossing?