论文部分内容阅读
已有这样的结论:过平面上的一点可引抛物线的法线的条数为1——3条(参见上海辞书出版社出版,唐秀颖编《数学解题辞典》(解析几何)P.600)。那么,究竟过哪些点可引抛物线的一条法线;哪些点可引两条法线;哪些点可引三条法线呢?本文就是想解决这个问题。
There has been such a conclusion: the number of normals that can be paraboloided in the plane is 1 to 3 (see Shanghai Lexicographical Publishing House, Tang Xiuying’s “Dictionary on Mathematical Problem Solving” (Analytic Geometry) P.600). . Then, what points can lead to a normal line of a parabola; which points can lead to two normals; which points can lead to three normals? This article is to solve this problem.