一次函数的知识是历年中考的热点和重点.具体要求是:掌握一次函数的概念、一次函数的图象及其性质,会利用一次函数及图象来解决实际问题,通过利用一次函数的概念及图象解决实际问题,培养学生的 The knowledge of a function is the focus and hotspot of the examination in the calendar year. The specific requirements are: grasp the concept of a function, the image and the nature of a function, use a function and image to solve practical problems, by using the concept of a function Image to solve practical problems, develop students