圆锥曲线中的定点定值问题是高考命题的一个热点,也是圆锥曲线问题中的一个难点。解这类题的基本思想是函数思想,可以用变量表示问题中的直线方程、数量积等,这些不受变量所影响的一个值就是定值。具体要求就是将要证明或要求解的量表示为某个合适变量的函数,化简消去变量得到定值。下面就以今年的几道高考真题为例,揭示一般做题方法。 The fixed point fixed value problem in conic curve is a hot topic in college entrance examination proposition and also a difficult point in conic curve problem. The basic idea of ​​solving such questions is the idea of ​​function, you can use variables that represent the equation in the equation, the number of products, these variables are not affected by the value of a fixed value. The specific requirement is to prove or require the solution of the volume expressed as a function of a suitable variable, simplify the elimination variable to be fixed. Here to take this year’s several college entrance examination Zhenti as an example, reveal the general method of doing things.