动点问题是近年来中考的一个热点,也是一个难点.对于这一类题,关键是要把动态问题转变为静态问题来解决,寻找运动中的“不变量”作为解决问题的突破口.一般的方法是:1.根据题意分清运动中的变量、不变量,并根据题意作出图形.2.按图形的几何性质及相互关系,找出基本关系式,把相 The dynamic point issue is a hot spot and a difficult point in recent years. The key to this type of issue is to turn dynamic issues into static ones, and to find the “invariant” in sports as a breakthrough point for solving problems. The methods are: 1. Distinguish the variables and invariants in the movement according to the questions, and make graphs according to the questions. 2. According to the geometrical characteristics and mutual relations of the graphs, find out the basic relational expressions.