函数、导数、不等式三者之间有着紧密的联系.导数是研究函数性质的有力工具,尤其是处理高次函数、分式函数、根式函数、指数函数、对数函数、三角函数以及它们的复合型函数问题时,更能体现其应用价值和思维价值.不等式 There is a close connection between functions, derivatives, and inequalities. Derivatives are powerful tools for studying the nature of functions, especially high-order functions, fractional functions, root functions, exponential functions, logarithmic functions, trigonometric functions, and their combinations. When the problem of type function, it can better reflect its application value and thinking value. Inequality