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一、造桥选址问题如图1,A和B两地在一条河的两岸,现在要在河上造一座桥MN,桥造在何处才能使从A到B的路径AMNB最短?(假定河的两岸是平行的直线,A到河岸的距离大于河宽,桥要与河垂直。)
I. Bridge site selection As shown in Figure 1, A and B are on both banks of a river. Now a bridge MN is to be constructed on the river. Where can the bridge make the shortest path from A to B AMNB? The two sides of the strait are parallel straight lines. The distance from A to the river bank is greater than the width of the river, and the bridge is perpendicular to the river.