同学们在进行抛物线定义的学习过程中,有一类问题始终是一大难点,它与抛物线的定义看似可以相互转换,但实际上又不是抛物线定义的等价问题。下面举例说明对这一类与抛物线定义相关的轨迹问题的研究。问题1平面上动点 Students in the parabolic definition of the learning process, there is a class of problems is always a major difficulty, it parabolic definition of seemingly can be converted to each other, but in fact is not the equivalent of the parabola definition. The following is an example of the study of this type of trajectory problem associated with parabolic definition. Question 1 moving point on the plane