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在二次函数与实际应用中,确定自变量的取值范围举足轻重,甚至决定结果的产生.在思考问题的过程中,必须经过以下步骤:(1)认真审题,根据题意,列出二次函数的解析式.(2)根据自变量的实际意义,确定其取值范围.(3)在自变量的取值范围内,运用公式法或通过配方法求出二次函数的最大值或最小值.以下两道题,确实给了学生很多的疑问.(一)自变量取整是实际问题中的常见事.探究2.计算机把数据存储在磁盘上,磁盘是带有磁性物质的圆盘,磁盘上有一些同心圆轨道,叫做磁道.如图,现有一张半径为45mm的磁盘.
In the quadratic function and practical application, it is important to determine the range of independent variables and even determine the result of the result.In the process of thinking, we must go through the following steps: (1) (2) According to the actual meaning of the independent variable, determine the range of its value. (3) Within the scope of the independent variable, use the formula method or the formula to find the maximum or minimum of the quadratic function Value. The following two questions, does give students a lot of questions. (A) rounding of independent variables is a common problem in practice .Investigation 2.Computer data is stored on disk, the disk is a disk with a magnetic substance , There are some concentric tracks on the disk, called tracks, as shown in the figure, there is a 45mm radius disk.