函数是数学中的一个重要概念,它与代数几何有着密不可分的关系,函数把几何中的形与代数中的数联系起来构成了数与形的第二结合(第一次数形结合是数轴),从而,使用代数的方法可以研究几何问题,故函数概念是一个非常重要的概念,同时又是一个较为抽像的概念,不易理解,更难掌握。 A function is an important concept in mathematics. It has an inseparable relationship with algebraic geometry. The function associates the shape in geometry with the number in algebra to form the second combination of number and shape (the first order combination is the number axis. Therefore, using the method of algebra can study geometric problems, so the concept of function is a very important concept. At the same time, it is a concept of abstraction, which is difficult to understand and difficult to grasp.