分段函数是函数研究中的一个重要内容,是高中函数问题的重要组成部分,是学习中的重点和难点,与分段函数有关的试题,大多是求函数的解析式、定义域、值域或函数图象等,考试中稍有不慎就会走入误区,有些观点甚至在一些辅导资料中以谬传谬、造成误导.分段函数作为函数中一个较难理 Segmentation function is an important part of function research, and it is an important part of the high school function problem. It is the key and difficult point in learning. Most of the questions related to the segment function are the analytical expression, definition domain and value range of the function. Or the function image, etc., inadvertently in the exam will enter the error zone, some of the opinions even in some tutorial materials to ruin, cause misleading. Piecewise function as a more difficult in the function