如图,A和B两地在一条河的两岸,现在在河上造一座桥MN桥造在何处才能使A到B的路径AMNB最短?(假定河的两岸是平行的直线,桥要与河岸垂直)
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![如图,A和B两地在一条河的两岸,现在在河上造一座桥MN桥造在何处才能使A到B的路径AMNB最短?(假定河的两岸是平行的直线,桥要与河岸垂直)](/uploads/image/z/6806966-14-6.jpg?t=%E5%A6%82%E5%9B%BE%2CA%E5%92%8CB%E4%B8%A4%E5%9C%B0%E5%9C%A8%E4%B8%80%E6%9D%A1%E6%B2%B3%E7%9A%84%E4%B8%A4%E5%B2%B8%2C%E7%8E%B0%E5%9C%A8%E5%9C%A8%E6%B2%B3%E4%B8%8A%E9%80%A0%E4%B8%80%E5%BA%A7%E6%A1%A5MN%E6%A1%A5%E9%80%A0%E5%9C%A8%E4%BD%95%E5%A4%84%E6%89%8D%E8%83%BD%E4%BD%BFA%E5%88%B0B%E7%9A%84%E8%B7%AF%E5%BE%84AMNB%E6%9C%80%E7%9F%AD%3F%28%E5%81%87%E5%AE%9A%E6%B2%B3%E7%9A%84%E4%B8%A4%E5%B2%B8%E6%98%AF%E5%B9%B3%E8%A1%8C%E7%9A%84%E7%9B%B4%E7%BA%BF%2C%E6%A1%A5%E8%A6%81%E4%B8%8E%E6%B2%B3%E5%B2%B8%E5%9E%82%E7%9B%B4%29)
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