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当自变量在不同范围内取值对应着不同函数解析式的一类函数称为分段函数 ,分类讨论求解是解决这类问题的基本方法 .纵观近年各省市中考试题发现 :涉及分类函数的试题占有相当的比例 ,它能考查同学们分析问题、讨论问题的能力 ,能培养我们思维的广阔性与深刻性 .下面以近年中考
A class of functions whose independent variables take values in different ranges corresponding to the analytical formulas of different functions is called a piecewise function. Classifying and discussing solutions is a basic method to solve such problems. Looking at the examination questions in various provinces and cities in recent years, we found that: The questions occupy a considerable proportion. It can examine the ability of students to analyze problems and discuss problems, and can cultivate the broadness and depth of our thinking.