在定义域中,对于自变量x的不同取值范围,对应法则不同,这样的函数称之为分段函数.对于分段函数定义应把握住两点:其一,分段函数是一个函数,而不是几个函数,它由各段上的解析式(对应法则)用符号“{”合并成一个整体;其二,分段函数 In the definition domain, for the different range of values ​​of the independent variable x, the corresponding law is different. Such a function is called a piecewise function. For the definition of the piecewise function, two points should be grasped: First, the piecewise function is a function, Instead of several functions, it consists of the parsing (corresponding rules) on each segment combined into a whole by the symbol “{”; second, the segmented function