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分段函数是指自变量在函数定义域的不同子集上有不同的对应关系时所确定的函数,它是一类表达形式很特殊的函数,是培养学生数学思想、渗透数学方法的一个很好的素材。因此,在新课程标准实验教材的“函数表示法”中的例题、练习和习题中多次出现的分段函数。而且分段函数在最近几年的高考试题中出现的较多,这就要引起我们对分段函数教学的重视。
A piecewise function is a function that is determined when an argument has a different correspondence on different subsets of a function's domain. It is a function of a very specific form of expression, a very important function in developing students' mathematical thinking and penetrating mathematical methods Good material Therefore, in the new curriculum standard experimental textbook “Function Notation ” in the examples, exercises and exercises repeatedly appeared in the segmentation function. And the piecewise function appeared more in the college entrance examination papers in recent years, which will cause us to pay attention to the teaching of piecewise functions.