函数概念是数学中最重要的知识点之一,是研究变量变化规律的基础。而函数的单调性能客观地反映函数图象的变化及变化规律。函数的单调性是离不开区间的,因此确定函数的单调区间,有助于理解掌握函数的单调性,深刻领会函数的内涵。本文通过具体事例来说明复合函数单调区间的确定方法。 The concept of function is one of the most important knowledge points in mathematics, which is the basis of studying the changing law of variables. The monotonous function of the function objectively reflects the change and variation of the function image. Monotonicity of the function is inseparable from the interval, so to determine the monotonous range of the function will help understand the monotony of the function, a deep understanding of the function of the connotation. In this paper, the specific examples to illustrate the monotonicity of the composite function to determine the method.