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有关圆锥曲线弦的二端点与原点连线的斜率问题 ,涉及解析几何中许多重要的知识点 ,在各种考试的试题中经常出现 .若用常规方法解决 ,运算量大、过程冗繁 .本文通过实例介绍这类问题的一种简捷解法 .例 1 (1993年上海市高考试题 )抛物线 ｙ=- 12 ｘ2 与过点Ｍ(0 ,- 1)的直线ｌ
The problem of the slope of the connection between the two endpoints of the conic curve and the origin relates to many important knowledge points in analytical geometry. It often appears in the examination questions of various examinations. If the conventional method is used to solve the problem, the calculation volume is large and the procedure is tedious. Examples illustrate a simple solution to this type of problem. Example 1 (1993 Shanghai High School Exam) Parabola y=- 12 x2 and the point M (0, -1)