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运用定义求轨迹定义法是求轨迹方法中一种重要的方法.当题干中出现一个点F、一条过点F关于原点的对称点且垂直于坐标轴的直线时,我们都有理由猜测是不是该用圆锥曲线的定义来解题了.若是到定点的距离等于定长的点的集合,那自然联想到圆.所以,在熟悉几种常见曲线的定义的基础上,从定义去找解决求轨迹问题的突破口,是一种重要的方法.
Using definitions to find a trajectory is one of the most important ways to find a trajectory. When there is a point F in the stem, a point F past a point of symmetry about the origin and a line perpendicular to the axis, we have reason to guess It is not the definition of a conic solution to solve the problem .If the distance to the fixed point is equal to the collection of points of fixed length, it naturally associated with the circle .So, familiar with the definition of several common curves, based on the definition to find solution It is an important method to find a breakthrough in the trajectory problem.