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函数是初中数学的重要内容之一,不仅研究从常量转化为变量之间的关系,而且可以用代数方法研究几何问题,对我们认识问题、分析问题、解决问题有着十分重要的意义。函数广泛存在于自然界的许多问题中,如圆的周长的大小变化,取决于圆的半径的大小变化;保持一定速度时,路程的变化取决于时间的变化;一天二十四小时气温的大小变化,取决于某一刻时间的变化;一定量的人民币存入银行,利息多少的变化取决于存期长短的变化等。这些问题具有一个共同的特点,就是在每个问题中都存在两个变量,其中一个变量发生
Function is one of the important contents of junior high school mathematics. It not only studies the relationship between constants and variables, but also can use algebraic methods to study geometric problems. It is of great significance for us to understand problems, analyze problems and solve problems. Functions exist widely in many problems in nature, such as changes in the size of the circumference of the circle, depending on the size of the radius of the circle; when maintaining a certain speed, the distance changes depending on the time; the temperature of 24 hours a day Changes depend on changes at a certain moment; a certain amount of RMB is deposited in banks, and the amount of interest varies depending on the length of the deposit. One of the common characteristics of these problems is that there are two variables in each problem, one of which occurs.