华师一附中数学组编写的数学综合题解共二百题,其中第197题是一个轨迹问题。解中求出了轨迹必须满足的部分条件是对的,但我认为尚不完全,因为轨迹不仅要具有完备性而且要具备纯粹性,两性具备了,才能肯定某图形为合条件点之轨迹。因为轨迹是为作图服务 The mathematics group of Huashi Shiyizhong mathematics group has a total of 200 questions, of which question 197 is a trajectory question. In the solution, it is correct to find some of the conditions that the trajectory must satisfy, but I think it is not complete, because the trajectory must not only be complete but also pure, and the two sexes must be able to confirm that the figure is the trajectory of the conditional point. Because the trajectory is for mapping services