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求曲线的方程是解析几何的基本问题之一，学生在学习如何求曲线的方程时，保证轨迹的完备性并不感到多么困难，他们常常能遵循探求轨迹的基本步骤，运用常规方法求出曲线上的点所满足的方程．但对判断由方程所确定的点是不是都是曲线上的点，往往思考不深入，常把一些不是...
One of the basic problems of analytical geometry is to find the equation of the curve. Students are not very difficult to ensure the completeness of the trajectory when they learn how to find the equations of the curve. They can often follow the basic steps of searching the trajectory and use conventional methods to find the curve. The equation satisfied on the point. But the point of judging from the equation is not the point on the curve, often thinking is not deep, often put some not...