1“将军饮马”模型古希腊亚历山大里亚城有一位久负盛名的学者,名叫海伦。一天,有位将军不远千里专程前来向海伦求教一个百思不得其解的问题:如图1,将军从A地出发到河边饮马,然后再到B地军营视察,显然有许多走法。问走什么样的路线最短呢?精通数学的海伦稍加思索,便做了完善的回答,这个问题后来被人们称作“将军饮马”问题。海伦解法:如图2,作点A关于河l的对称点A’, 1 “generals to drink horse ” model Ancient Greek city of Alexandria has a prestigious scholar named Helen. One day, a general came a long way to come to Helen to ask a baffling question: As shown in Figure 1, the general set out from A to the river to drink horses, and then to B to inspect the barracks, apparently many go law. Asked what kind of shortest route it? Helen mathematical proficiency a little thought, then made a sound answer, this question was later known as “generals to drink horse ” issue. Helen solution: As shown in Figure 2, for point A on the symmetry of the river l A ’