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问题在直线1上求一点P使|PA-PB|的值最小.
做法连接AB作AB的中垂线与直线1的交点即为P
此时$\left|\mathrm{PA}-\mathrm{PB}\right|=0$
<div style="text-align: center;"><img src="imgs/img_in_image_box_327_161_947_317.jpg" alt="Image" width="48%" /></div>
问题在直线1上求一点P使|PA-PB|的值最大做法作直线AB与直线1的交点即为P根据三角形任意两边之差小于第三边$\left|\mathrm{PA}-\mathrm{PB}\right|\leq\mathrm{AB}$ PA-PB|的最大
$ 值 =AB$