学生在做几何题时,常常忽视图形的性质的挖掘和使用,造成解题困难,尤其是做解析几何题,常因此陷入繁琐的计算之中.一般说来,一道几何题的实质内容常常直观地反映在图形上,我们应该充分利用图形的性质去寻求解题的途径,找出简捷的解题方法. When students do geometry problems, they often overlook the drawing and use of the nature of the graph, which makes it difficult to solve the problem. This is especially true for analytic geometry problems, which often leads to tedious calculations. Generally speaking, the substance of a geometry problem is often intuitive. The ground is reflected in the graph, we should make full use of the nature of the graph to find ways to solve the problem and find a simple way to solve problems.