近几年来,出现了很多的创新型试题,特别是新定义函数题,本文选取几类进行赏析,供读者参考.一、科比函数(闭函数)若定义域为D的函数f(x)同时满足以下两个条件:(1)函数f(x)在D上单调递增或递减;(2)存在闭区间[a,b]D,使函数f(x)在[a,b]上的值域为[a,b].那么称函数f(x)为科比函数,[a,b]称为函数f(x)的科比区间.例1判断函数f(x)=-x3(x∈R)是否是 In recent years, there have been a lot of innovative questions, especially the new definition of function problems, this paper selects a few categories for appreciation, for readers reference.First, the Kobe function (closed function) if the domain D function f (x) The following two conditions are satisfied: (1) the function f (x) increases or decreases monotonically on D; (2) there exists a closed interval [a, b] Then the function f (x) is called the Bryant function, and [a, b] is called the Bryant range of the function f (x). Example 1 Judging function f (x) = - x3 R) yes or no