在生产实践中,常常会遇到一些关于极值的问题。在数学里,解决这类问题的强有力的工具是微分学与变分法。但在不少情况下,只用初等方法也可以较方便地把它解决。用初等方法解极值问题,一般可分为代数法、三角法、几何法三类,它们都具有局限性。但 In production practice, you often encounter some questions about extreme values. In mathematics, powerful tools for solving such problems are differential calculus and variational methods. However, in many cases, it can be solved more simply by using the elementary method. The use of elementary methods to solve extreme problems can generally be divided into three categories: algebraic methods, trigonometric methods, and geometric methods, all of which have limitations. but