摘要
本文研究了分段函数在分界点处求导数的类型，给出了处理分段函数在分界点处求导数的新结论并给予证明。
This article discusses the type of derivative at point of demarcation of sectionally function and gives a new conclusion of the methods to solveit and demonstrate it.
关键词
分段函数
极限
连续
导数
sectionally function
limit
continuity
derivative
