我们知道，函数概念是实际问题中变量之间的一种依赖关系的抽象和概括．在函数问题中，如何确定实际问题中变量之间的函数关系式，是一类极为重要的题型．这类问题的解答能有效地考查同学们分析问题、解决问题的能力．因此，在近年全国各省市的中考命题中，命这方面的试题是一? We know that the concept of a function is an abstraction and generalization of a dependency between variables in an actual problem. In function problems, how to determine the functional relationship between variables in practical problems is a very important question type. The answers to such questions can effectively examine the ability of students to analyze problems and solve problems. Therefore, in the examination propositions of various provinces and cities across the country in recent years, what are the questions in this area?