【内容说明】函数既是高中数学中的重要内容也是一条纽带,函数的观点和方法贯穿整个高中数学的全过程,又把中学数学的各个分支紧紧连在一起.学生在系统学习过必修一中的指数函数、对数函数及幂函数后,他们的函数知识掌握情况及函数的意识如何,需要通过新的函数研究加以检验;本课例选用对勾函数作为研究对象,一是因为对勾函数作为一种常见而又特殊的函数,其单调性较基本初等函数复杂,同时涉及到多种 【Content】 The function is not only an important part of high school mathematics, but also a link between the function of the point of view and methods throughout the whole process of high school mathematics, and all the branches of mathematics in secondary schools closely linked together. Exponential function, logarithmic function and power function, their knowledge of the function of knowledge and how the function of consciousness, need to be tested through a new function study; this lesson choose to use the hook function as the research object, first, because the hook function As a common and special function, its monotonicity is more complex than the basic elementary functions,