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在现行高中数学二次曲线一章中,关于双曲线切线的问题(如求切线方程及证明题等),一般都是利用“判别式法”以求解或证明的。应当注意,此法有时会出现问题,必须加以剖析。一、有关直线与双曲线相切条件的剖析例1.已知直线y=kx+m和双曲线
In the chapter of current high school mathematics quadratic curve, questions about hyperbolic tangent (such as tangent equations and proving questions, etc.) are generally solved or proved by using “discriminative method”. It should be noted that this method sometimes has problems and it must be analyzed. I. Anatomy about the condition of line and hyperbola tangent conditions 1. Known straight line y=kx+m and hyperbola