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分段函数是指自变量在不同的取值范围内,其对应法则也不同的函数.分段函数是一个函数,而不是几个函数;分段函数的定义域是各段定义域的并集,值域是各段值域的并集.以分段函数为载体的问题已成为高考中的热点问题下面对这类问题进行归类解析.
A piecewise function is a function whose independent variables are in different ranges and whose corresponding rules are also different. A piecewise function is a function, not a few functions; the domain of a piecewise function is the union of the domain of each piece. The value domain is the union of each segment value domain. The problem of using segment function as the carrier has become a hot issue in the college entrance examination.