利用导数解决函数的单调性和极值(最值)问题,经常需要进行分类讨论,所以导数与分类讨论结下了不解之缘.对这类问题许多同学缺乏信心,觉得这类问题较难把握,其实不然,这类问题无非是四种类型的参数讨论. Derivative solves the monotonicity and extremum (most value) problems of the function, often need to be classified discussion, so the derivative and classification discussion has brought about the indissoluble bond. Many students on such issues lack confidence, think this kind of problem is more difficult Grasp, it is not true, this type of problem is nothing more than four types of parameter discussion.