求函数值域问题是高考中的热点问题,其综合性较强且方法灵活多样,根据不同类型问题,采用相应的策略,可以有效提高我们的解题效率,下面分类例析,以供参考. The problem of function value range is a hot issue in the college entrance examination. Its comprehensiveness is strong and the method is flexible. According to different types of problems, the corresponding strategies can effectively improve our problem solving efficiency. The following classification examples are provided for reference.