在各地中考题中,我们常常会碰到下列移动问题:即一个(或两个)点在线段上移动,当移动时间是多少时,这两个动点之间的距离等于已知量,或某两条线段相等,或某两个三角形相似等.解决这类问题的基本方法是“化动为静”.下面举几例,供同学们学习时参考.一、利用勾股定理求时间例1如图1,在△ABC中,∠B=90°,AB=6cm,BC=3cm,点P从点A开始,沿AB方 Of the mid-term examinations, we often encounter the following movement problem: One (or two) points move on the line segment. When the moving time is equal, the distance between these two moving points is equal to the known amount or Some two line segments are equal, or some two triangles are similar, etc. The basic method to solve this kind of problem is “Move to be quiet ” Here are a few examples for students to learn reference. Time Example 1 As shown in Figure 1, in △ ABC, ∠B = 90 °, AB = 6cm, BC = 3cm. Point P starts from point A and moves along AB