核心知识梳理了解常量、变量的意义,了解函数的概念和三种表示方法(列表法、图象法、解析式法),能用适当的函数表示法刻画实际问题中变量之间的关系,能确定函数自变量的取值范围,能根据条件写出函数关系式和求出函数值,会用描点法画出函数图象,结合图象对简单实际问 The core knowledge is to understand the meaning of constants and variables, to understand the concept of functions and three representations (list method, image method, analytic method), to describe the relationship between variables in practical problems by using appropriate functional representations Determine the value range of function arguments, according to the conditions to write out the functional relationship and find the value of the function, will use the point method to draw the function image, combined with the image of the simple real question