求曲线的轨迹方程是解析几何研究的两个基本问题之一,求指定圆锥曲线的方程的试题一般涉及量较多,计算量大．可以考查识图、画图、数形结合、等价转化、分类讨论、逻辑推理、合理运算及创新思维能力．解决这类问题常采用“三定”的策略,即:先定形、后定式、再定量的策略。定形——指的是所求方程的圆锥曲线类 Finding the trajectory equation of the curve is one of the two basic problems in the study of analytical geometry. The test questions for the equations of the specified conic section generally involve a large amount of calculation and a large amount of calculation. Can examine drawings, drawing, combination of number and shape, equivalent transformation, classification discussion, logical reasoning, reasonable calculations and innovative thinking skills. To solve this type of problem, we often adopt the “three-determined” strategy, that is, the first shaping, postfixing, and requantitative strategies. Styling—refers to the conic section of the equation