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函数的知识有着广泛的应用.从实际问题建立函数关系式,不仅是用函数等知识解决实际问题的关键,而且是数学理论与实际相结合的一座重要桥梁.那么,怎样从实际问题建立函数关系式呢?笔者认为,归纳起来,在中学里就所用的方法而言,可分为直接列式法、方程转化法、图象转化法、待定系数法和经验公式法等几种.就其建立函数关系式的步骤来说,可先确定表示自
Knowledge of functions has a wide range of applications. Building functional relationships from practical problems is not only the key to solving practical problems with knowledge of functions, but also an important bridge for the combination of mathematical theory and practice. Then, how to build functional relationships from practical problems? What is the formula? In my opinion, to sum up, in the middle school in terms of the methods used, it can be divided into direct list method, equation conversion method, image conversion method, undetermined coefficient method and empirical formula method. For the functional relational steps, it can be determined first