对渡河最短路程的再讨论陕西省商州中学党效文文［１］给出问题：设河宽为Ｓ０，水流速度为ｖ０，船在静水中的速度为ｖ．问船以怎样的方向渡河才能保证所走的路程最短．我们先看文［１］给出的解答：如图所示，设船行方向与水流方向的夹角为α．在水流作用下船实际行走... The re-discussions on the shortest distance to the river crossing in Shaanxi Province Shangzhou Middle School party text [1] gives the question: Let the river width be S0, the water velocity v0, and the speed of the ship in still water v. Ask the boat how to cross the river in order to ensure the shortest distance. We first look at the solution given in [1]: As shown in the figure, the angle between the orientation of the ship and the direction of flow is α. Under the effect of water flow, the ship actually walks...