关于函数值域求法探讨

Exploration about the Evaluation Method of Function

在数学应用中 ,常常要用到给定函数的值域 ,而对函数值域的求法 ,现行的教材、教参中均未系统给出 ,本文总结出几种常见函数值域求法。

Numerial range of given function is always used in t he mathematical application.b ut evaluation methods aren's systematically provided in the teaching materials b eing used now and the reference books.