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定义法若动点的轨迹满足已知曲线的定义(如圆锥曲线的定义),则可根据题意设定方程,然后再来确定其中的基本量.
Definition method If the trajectory of the moving point satisfies the definition of the known curve (such as the definition of the conic curve), the equation can be set according to the question and then the basic amount can be determined.