引入、设立参数,并利用参数解题是我们常用的解决数学问题方法,特别是在解析几何问题中,此方法被经常提及,这种方法使得数学中一些动态几何问题的解决变得简单、容易了.而参数的设立、引入往往不是难点,参数的退却、消去才是解题的难点.根据笔者学习数学的经验,在数学解题过程中,参数消去主要是在两个时间节点上;其一,是在解题过程的中途,此时若在一个关系式中,参数t比较容易与x、y分离出来, Introducing, setting parameters and using parameter solving is our common method to solve mathematical problems, especially in the analysis of geometric problems, this method is often mentioned, this method makes the solution of some dynamic geometric problems in mathematics simple, Easy to set up the parameters, the introduction is often not difficult, the parameters of the retreat, elimination is the difficulty of solving problems.According to the author's experience of learning mathematics in the mathematical problem solving process, the parameter elimination is mainly in the two time nodes; First, halfway through the problem-solving process, if at this moment a parameter t is relatively easy to separate from x and y,