不管是数列还是函数,都是高考中比较重要的考察部分.苏教版必修1第二章函数的概念:一般地,设A、B是两个非空的数集,如果按照某种对应法则f,对于集合A中的每一个元素x,在集合B中都有唯一的元素y和它对应,那么这样的对应叫做从A到B的一个函数,通常记为y=f(x),x∈A,其中,所有的输入值x组成的集合叫做函数y=f(x)的定义域,所有 Whether it is a series or function, are more important part of the entrance examination .Sujiao version compulsory 1 Chapter second, the concept of function: In general, set A, B is two non-empty number set, according to some corresponding law f, for each element x in set A, there is a unique element y in set B corresponding to it, then such a correspondence is called a function from A to B, usually denoted by y = f (x), x ∈A, where the set of all input values ​​x is called the domain of the function y = f (x) and all