解析几何问题的求解离不开运算,甚至有时候成功与否都取决于运算.过于繁琐的运算不但影响解题速度,也极容易出错.因此,尽量减少运算量成为迅速、准确解题的关键.以下介绍解析几何运算“减负”的一些常用方法.一、建立恰当的坐标系例1已知半径为R的定圆F1及其内部距离F1为2c的定 The solution to the problem of analytical geometry can not be separated from the operation, and sometimes even success depends on the operation. Overly tedious operations not only affect the speed of the problem, but also extremely easy to make mistakes. Therefore, minimizing the amount of calculation becomes the key to solving problems quickly and accurately. Here are some commonly used methods to analyze the “negligence” of the analytic geometry operations. First, establish an appropriate coordinate system. Example 1 A fixed circle F1 with a radius R is known and its internal distance F1 is 2c.