在高三综合训练中,我们常遇到一些与函数式有关的不等式问题,由于这类问题易与抽象函数融合在一起,更增加了它的难度.求解时,我们一般分三步进行:(1)顺用或逆用已知的函数式,将原不等式转化为两个函数的大小关系;(2)判断函数的单调性;(3)由函数的单调性,脱去函数符号并结合函数的定义域构建不等式(组).下面举例说明. In the third year of comprehensive training, we often encounter some inequalities related to the functional formula. Because this type of problem is easy to integrate with abstract functions, it also increases its difficulty. When solving, we generally take three steps: (1 ) Using or inversely using a known function, transform the original inequality into the size relationship of two functions; (2) determine the monotonicity of the function; (3) by the monotony of the function, remove the function symbol and combine the function Define the domain construction inequality (group). Here is an example.