定义域和值域是函数的重要要素,有些函数问题,给出了函数的定义域或值域的信息,反过来求函数的解析式或者探求参数的取值(或取值范围),考查学生的逆向思维能力.本文介绍与定义域和值域有关的几个函数问题,供大家参考.例1已知二次函数f(x)=x2+bx+c(b≥0,c∈R),若f(x)的定义域为[-1,0]时,值域也 Defining domains and ranges is an important element of a function. Some function problems give information about the domain or range of a function, which in turn calls for the analytic expression of the function or the value (or range of values) Of the reverse thinking ability.This paper introduces several function problems related to the domain and the range of values ​​for your reference.Example 1 known quadratic function f (x) = x2 + bx + c (b≥0, c∈R) , If the domain of f (x) is [-1,0], the domain of value is also