函数的单调性一节中的知识是今后研究具体函数的单调性理论基础;在解决函数定义域、值域、比较两数大小、不等式的证明等具体问题中均需用到函数的单调性;在历年的高考中对函数的单调性考查 The monotonicity of the function is the theoretical basis for the study of the monotonicity of the concrete function in the future. The monotonicity of the function needs to be solved in solving the problem of the domain of function, the range of values, the comparison of the size of two numbers and the proof of inequality. Monotonicity test of functions in college entrance examination over the years