“平面直角坐标系”主要研究平面直角坐标系的有关概念以及坐标等知识的简单应用,是今后学习函数图像、函数、方程和不等式的基础,也是用代数方法研究几何问题的有力工具.但是有部分同学在解决问题时常出现错误,主要原因是同学们审题不清.现针对同学们经常出现的错误作一些剖析,希望能给同学们的学习带来帮助. “Plane Cartesian Coordinate System” mainly studies the concept of the plane rectangular coordinate system and the simple application of the knowledge of coordinates, etc. It is the basis for learning function images, functions, equations and inequalities in the future, and it is also a powerful tool for studying geometric problems with algebraic methods. However, some students often make mistakes in solving problems. The main reason is that the students do not examine questions clearly. Now they are analyzing the mistakes that often occur in classmates, hoping to help students with their studies.