在学习平面直角坐标系的内容时,我们曾经学过点的坐标平移规律:将点(x,y)向右(或向左)平移a个单位长度,可以得到对应点(x+a,y)或(x-a,y);将点(x,y)向上(或向下)平移b个单位长度,可以得到对应点(x,y+b)或(x,y-b).当时限于所学的知识,对于这个规律的应用仅限于解决一类“已知平移前(后)点的坐标及平移的方向(水平方向或竖直方向)和距离求平移后(前)点的坐标”问题,其实这个看似简单的规律还有用场. When learning the content of a Cartesian coordinate system, we have learned some laws of coordinate translation: By shifting the point (x, y) to the right (or to the left) by a unit length, the corresponding point (x + a, y (X, y + b) or (x, yb) can be obtained by shifting the point (x, y) upwards (or downwards) by b units of length. Knowledge, the application of this law is limited to solving the problem of a class of "known coordinates before and after translation (back) point of the direction of translation (horizontal or vertical direction) and distance In fact, this seemingly simple law is still useful.