平面解析几何是在平面坐标系的基础上，借助代数方法来研究几何问题的一门数学学科，因此代数运算便不可避免地出现在解析几何的解题过程之中，若方法不当，就会使解题过程繁琐冗长，直接影响解题速度和结果的准确性．如何避免非必要的运算，简化解题过程呢？在解析几何中用设 Plane analytical geometry is a mathematics discipline that studies geometric problems with the help of algebraic methods on the basis of plane coordinate systems. Therefore, algebraic operations inevitably appear in the analytical problem solving process. If the method is not appropriate, it will make The problem-solving process is cumbersome and lengthy, which directly affects the speed of the problem solving and the accuracy of the results. How to avoid unnecessary calculations and simplify the problem solving process? Used in analytic geometry