解析几何中的定点、定值问题一直是高考和竞赛中的热点问题之一,由于现行教材对这个问题没有作专门的介绍,因此也成了高中数学的难点之一.事实上,对这类问题的解答还是有规律可循的,如:证明动直线过定点的解题步骤可归纳为:一选、二求、三定点.具体操作程序如下:一选:选择参变? Analytical geometry in the fixed point, fixed value problem has always been one of the hot issues in the college entrance examination and competition, as the current teaching material does not make a special introduction to this issue, it has become one of the difficulties of high school mathematics.In fact, The solution to the problem is still a rule-based, such as: proves that moving the line over a fixed point of the problem-solving steps can be summarized as: one election, two seeking, three fixed-point specific operational procedures are as follows: a election: choose to change?