圆锥曲线中求范围、定点、定值的问题,由于其难度大、计算复杂等特征,一直是高中生学习的一个难点.很多时候学生有想法,能够设计出有效解题方案,但在繁杂的计算过程中却因笔误、计算失误等原因导致丢分严重.如果通过对题目条件的解读,能够利用特例或运动极限观快速猜测出答案,则为构建解题思路和解题技巧提供了方向,还可以及时发现 Because of its difficulty and complexity of calculation, the problem of seeking the range, fixed point and fixed value in conic curve has always been a difficult point for senior high school students to learn.Many times students have the idea to design effective solutions, but in complicated But due to clerical error, calculation error and other reasons lead to serious drop.If you interpret the subject conditions, can use the special case or the motion limit to quickly guess the answer, then the problem-solving ideas for the construction and problem solving skills provide a direction, Can also be found in time