初中阶段求函数的最值常用的思想方法有:根据函数的定义、增减性等函数性质,转化为不等式问题,求出函数的最值.利用函数与方程、不等式的相互转化求解,把问题转化为解方程或不等式.利用不等式x+y≥2√xy(x>0,y>0)中蕴含的相等与不等之间相互转化求解.利用数形结合思想,把满足条件的图形画出或构建几何图形,化归几何问题求解.下面以例举方法加以说明. In junior middle school, the most commonly used method of thinking is as follows: According to the definition of functions, the nature of the functions such as addition and subtraction, we transform the problem into the inequality problem and find out the value of the function.With the transformation of function and equation and inequality, To solve the equation or inequality using the inequality x + y ≥ 2√xy (x> 0, y> 0) contained in the equality and inequality between the transformation of each other using the combination of figures and figures to meet the conditions of the graphics Out or build geometry, to solve the geometric problems. The following examples to illustrate.