学习了平面直角坐标系后,经常会遇到一些求对称点坐标的问题.我们知道,点的对称主要有关于x轴对称、关于y轴对称和关于原点对称,而且符号变化规律为:关于x轴对称,横坐标不变,纵坐标互为相反数;关于y轴对称,横坐标互为相反数,纵坐 After learning planar Cartesian coordinate system, we often encounter some problems of seeking coordinates of symmetric points. We know that the symmetry of the point is mainly about the x-axis symmetry, about the y-axis symmetry and symmetry about the origin, and the law of the sign change is: Axisymmetric, abscissa unchanged, ordinate each other the opposite; on the y-axis symmetry, the abscissa of each other the opposite number, vertical