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这是现行教材《平面解析几何》第63页的例2:点M与两条互相垂直的直线的距离积是常数k(k>0),求点M的轨迹方程。教材在导出方程
This is the case of the current textbook “Plane Analytic Geometry” on page 63. Example 2: The distance product of a point M and two straight lines perpendicular to each other is a constant k (k>0), and the trajectory equation of the point M is obtained. Textbooks in the derived equation