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圆锥曲线中的定值与定点问题一直是近几年来高考试题中的热点问题,由于这类问题在解题之前不知道定值与定点的结果,因而对解题增添了一定的难度。解决这类问题时,要善于在动点的“变”中寻求定值或定点的“不变”性,常用特殊值法(如直线的斜率为0、斜率不存在等)先确定定值或定点,再转化为有目标的一般性证明,从而达到解决问题的方法。本文
The problem of fixed value and fixed point in conic curve has always been a hot issue in the college entrance examination exams in recent years. Because such problems do not know the result of fixed value and fixed point before solving the problem, they add some difficulty to solving the problem. To solve such problems, we should be good at moving point “change ” in the search for fixed or fixed “constant ” sex, commonly used special value method (such as the slope of the line is 0, the slope does not exist, etc.) Determine the value or fixed point, and then converted into a targeted general proof, so as to achieve the solution to the problem. This article