一、案例说明在新课程标准下,导数的初步知识以及导数的应用,已经成了解决实际生产、工程技术、经济甚至日常生活问题的重要工具,随着改革的深入及素质教育的要求,三次函数的切线问题又是该章的一个难点。我们根据导数的几何 I. Case Description Under the new curriculum standard, the initial knowledge of derivatives and the application of derivatives have become an important tool to solve the problems of actual production, engineering technology, economy and even daily life. With the deepening of reform and the requirements of quality education, three times The tangent of the function is a difficult part of the chapter. We are based on the geometry of the derivative