解有关圆锥曲线的问题，尤其是两条曲线的位置关系问题，往往运算量较大，若能熟练地掌握圆锥曲线的概念，选择合理的解题途径和方法，往往能优化解题过程，减少运算量．1利用圆锥曲线的定义圆锥曲线的定义刻划了动点与定点（或定直线）距离之间的不变关系，利用这个不变关系， Solving the problem of conic section, especially the problem of position relationship between the two curves, often has a large amount of calculation. If you can master the concept of conic curves and choose reasonable approaches and methods for problem solving, you can often optimize the problem solving process. Computation. 1Using the definition of the conic curve The definition of the conic curve characterizes the constant relationship between the fixed point and the fixed point (or fixed line) distance. Using this constant relation,