分段函数在分界点求导的一种简单的方法

介绍了用多项式根的性质与导数极限定理求分段函数在分界点的导数的简单方法。从而拓广了用导数定义求分界点导数的传统方法

A Simple Method to Derivate Piecewise Function at the Boundary Point

The paper introduces the property theorem about roots of polynomial and the derivate limit theorem,by which we can study the derived number of a break point of piecewise function.This paper expanded the method of studying the derived number of the break point of piecewise function.;