众所周知,坐标轴把平面分为第一象限、第二象限、第三象限、第四象限。平面内点的位置与有序数对之间是一一对应的。然而,平面直角坐标系中隐藏着很多知识,对于初学者来说很难全面把握。为了帮助同学们学好“平面直角坐标系”的相关知识,笔者结合多年来的教学经验将此知识点归纳如下,供同学们学习参考。 As we all know, the axis of the plane is divided into the first quadrant, the second quadrant, the third quadrant, the fourth quadrant. There is a one-to-one correspondence between the position of in-plane points and the pairs of ordinal numbers. However, there is a lot of knowledge hidden in the Cartesian coordinate system, which is hard for beginners to grasp completely. In order to help students learn “Plane Cartesian coordinate system ” related knowledge, the author combined with years of teaching experience will be summarized as follows for the students to learn for reference.