抽象函数问题是近几年高考的热点,也是大多数学生学习的难点.常见的抽象函数问题中单调性的判断更是一大难点,那么应如何判断抽象函数的单调性呢?对这类问题认真分析和研究,找到解决问题的规律,也就不难突破这一难点了.下面是几个常见“恒等式型”抽象函数单调性的判定及其等价形式. Abstract function problem is the hot spot in college entrance examination in recent years, but also most of the difficulties for students to learn. Common abstraction function problems Monotonicity is more difficult to judge, then how should we judge the monotonicity of abstract function? Careful analysis and research to find the law to solve the problem, it is not difficult to break through this difficulty. Here are several common “identity type ” monotonicity of the abstract function of the judgment and its equivalent form.