按同学们现在所学的知识,提到的实际问题中的“最值问题”,一般指“支出最少”、“产值最多”、“利润最大”等问题。解决这类问题时,首先要根据已知条件正确确定函数解析式,然后确定自变量的取值范围(要符合题意),最后利用一次函数的性质和自变量的取值范围去分析最值,作出决策。 According to the knowledge that the students are now learning, the “most value problem” in the practical problems mentioned generally refers to such issues as “minimum expenditure”, “maximum output value” and “maximum profit”. To solve such problems, we must first correctly determine the function analytical formula based on the known conditions, and then determine the range of values ​​of the independent variables (to be consistent with the meaning of the problem), and finally use the nature of the first function and the range of values ​​of the independent variables to analyze the most value. Make decisions.