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根据已知条件求动点的轨迹方程,是解析几何的基本知识,课本在谈到曲线的方程和方程的曲线时,指出两个关系:①曲线上的点的坐标都是方程的解;②以这个方程的解为坐标的点都在曲线
The trajectory equation of the action point according to known conditions is the basic knowledge of analytical geometry. When the textbook talks about the curve equation and the curve of the equation, it points out two relations: 1 The coordinates of the point on the curve are all solutions of the equation; 2 The points with the solutions of this equation as coordinates are all on the curve