函数是从集合点出发的重要数学模型,是数集到另外一个数集的对应.函数的基本理念就是从变化的运动角度出发,观察变量之间的关系,将实际问题用函数的形式表现出来.同时函数理念也是数学解题的方式的优化渗透.同时,将问题看作是一个函数整体,综合所有已知条件从整体入手解决问题,也是函数理念的一种解题方式. The function is an important mathematical model starting from the point of assembly, and is the correspondence of the number set to another number set. The basic idea of ​​the function is to observe the relationship between variables from the perspective of changing movement, and present the actual problem in the form of a function At the same time, the concept of function is also the optimization infiltration of the way of solving mathematical problems.At the same time, we regard the problem as a whole function, solve the problem from the whole with all the known conditions, and also a way to solve the function concept.