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高中数学中与圆有关的定点、定值问题是高考考查的热点和难点问题之一,自然也是高三复习备考的重要内容之一。从多年的经验来看,学生于此类问题的求解颇感为难。其实,有经验的数学老师都知道,这类问题中一般都存在变量或动点,其解答的过程也如出一辙:先设出参数,再通过推理计算运用方程思想和等式恒成立的性质来求解结果;也可以在推理计算前先考查特殊位置探索出定点或定值,然后再进行推理或证明。下面举例说明解答此类问题
High school mathematics and circle-related fixed-point, the value of the college entrance examination test is one of the hot spots and difficult issues, of course, is one of the important content of senior high school review preparation. From many years of experience, students find it hard to solve such problems. In fact, experienced math teachers all know that such problems generally have variables or moving points, and the process of answering is exactly the same: setting parameters first, and then using reasoning to calculate the equations and equations to establish the properties of constant solutions Results; can also be calculated before the reasoning to explore a special location to explore fixed or fixed value, and then inference or proof. Here’s an example to answer such questions