[复习说明 ]由于平面解析几何中所研究的许多图形是对称图形 ,于是相关的对称变换问题经常在全国高考试卷与各地模拟试卷中出现 ,它是高考复习的一个热点专题 .本专题复习的重点是两点关于直线成轴对称问题 ;难点是两曲 (直 )线关于直线成轴对称问题 .[内容提要 ]1 .点 P(x,y) [Review] Since many of the figures studied in the plane analysis geometry are symmetrical, the related symmetry transformation problems often appear in the national examination papers and local mock examination papers. It is a hot topic for the college entrance examination review. The focus of this topic review It is two points about the linear symmetry of the line; the difficulty is that the two lines (straight line) are axisymmetrical about the line. [Contents] 1. Point P (x, y)