导数作为高中数学的工具性知识,应用相当广泛,是近年各地高考的重点与热点。利用导数研究函数极值问题更是重点中的重点,同学们在学习时要着重关注三点。关注1:用导数求函数的极值方法利用可导函数求函数极值的基本方法:设函数y=f(x)在点x_0处连续且f’(x_0)=0。若在点x0附 Derivatives as a tool for high school mathematics knowledge, a wide range of applications, in recent years, the focus of college entrance examination and hot spots. The use of derivatives to study the function of the extreme value problem is more important in the focus, students should focus on learning three points. Note 1: Deriving the Extremum Method for Derivative Functions Using the Derivative Function to Determine the Extremum of Functions: Let the function y = f (x) be continuous at point x_0 with f ’(x_0) = 0. If at x0 attached