这里所说的最值问题重点在于挖掘问题中的隐含条件,把问题转化为与函数联系、与不等式联系,从而用常规方法求出最值.转化的关键则在于如何设出变量.这个变量设出后,既要反映问题中变化的特征本质,又要为便于转化作准备.不同的设法,将会得到不同的目标函数以及不同的限制范 The value of the most important issue here is to tap the implicit conditions in the problem, the problem is transformed into contact with the function, and inequality, so as to get the most value in the conventional method.Transformation of the key lies in how to set variables.This variable Once set up, it is necessary to reflect the nature of the characteristics of the changes in the problems and to prepare for the facilitation of transformation. Different approaches will result in different objective functions and different limits