涉及函数单调性的问题包括解不等式、求最值、比较大小、乃至解方程 ,这些都是近年高考的热点问题 .若利用单调性定义求解 ,一般较为复杂 ,做此类题目时学生往往半途而废 ,失分率较高 .高中教材引入导数以后 ,利用导数解决这类问题就变得比较简单 ,学生也易于接受 .函数的单调? Problems involving the monotony of functions include solving inequalities, finding the best value, comparing the sizes, and even solving the equations. These are the hot topics of the college entrance examination in recent years. If we use the definition of monotonicity to solve the solution, it is generally more complicated. When doing such a problem, the students often stop halfway. With higher scores, after the introduction of derivatives in high school textbooks, the use of derivatives to solve such problems becomes easier and students are more easily accepted. Is the function monotonous?