如图,a和b两地在同一条河的两岸,现要在河上造一座桥mn,较早在何处才能使a到b的路径amnb最短?D:\My Documents\My Pictures\未命名.bmp画两条平行线平行线的上边和下边分别是a和b(本人水平极差,不
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![如图,a和b两地在同一条河的两岸,现要在河上造一座桥mn,较早在何处才能使a到b的路径amnb最短?D:\My Documents\My Pictures\未命名.bmp画两条平行线平行线的上边和下边分别是a和b(本人水平极差,不](/uploads/image/z/7253667-27-7.jpg?t=%E5%A6%82%E5%9B%BE%2Ca%E5%92%8Cb%E4%B8%A4%E5%9C%B0%E5%9C%A8%E5%90%8C%E4%B8%80%E6%9D%A1%E6%B2%B3%E7%9A%84%E4%B8%A4%E5%B2%B8%2C%E7%8E%B0%E8%A6%81%E5%9C%A8%E6%B2%B3%E4%B8%8A%E9%80%A0%E4%B8%80%E5%BA%A7%E6%A1%A5mn%2C%E8%BE%83%E6%97%A9%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%3FD%3A%5CMy+Documents%5CMy+Pictures%5C%E6%9C%AA%E5%91%BD%E5%90%8D.bmp%E7%94%BB%E4%B8%A4%E6%9D%A1%E5%B9%B3%E8%A1%8C%E7%BA%BF%E5%B9%B3%E8%A1%8C%E7%BA%BF%E7%9A%84%E4%B8%8A%E8%BE%B9%E5%92%8C%E4%B8%8B%E8%BE%B9%E5%88%86%E5%88%AB%E6%98%AFa%E5%92%8Cb%EF%BC%88%E6%9C%AC%E4%BA%BA%E6%B0%B4%E5%B9%B3%E6%9E%81%E5%B7%AE%EF%BC%8C%E4%B8%8D)
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