在抛物线中定值、定点、定直线问题,往往有一定的综合性,其分析与解答需要一定的理论知识与运算能力,是集分析、运算于一体的具有中等难度的综合问题.也是命题人在命题过程中比较喜欢的一种类型,在单元训练、高考模拟、高考、竞赛等试卷中经常看到. In the parabola, the problems of fixed value, fixed point, and fixed line often have a certain degree of comprehensiveness. The analysis and solution require a certain amount of theoretical knowledge and computing ability. It is a comprehensive problem of medium difficulty that integrates analysis and calculation. It is also a propositional person. One type of favorite in the proposition process, often seen in the unit training, college entrance examination simulation, college entrance examination, competition and other test papers.