对三次函数及其图形特点的讨论

A Discussion of Cubic Functions and its graph

三次函数:y=ax3+bx2+cx+d(a≠0)是常见的一类初等函数,对其单调性、凹凸性的研究,有利于解决生产实践中遇到的相关问题。利用高等数学的有关知识对三次函数进行较系统的研究。

The cubic function, y = ax^3 ＋ bx^2 ＋ cx ＋ d（ a≠0）, is a common elementary function. The analysis on its ruggedness contributes to solving the concrete problem in practice. A systematic research on the cubic function with relative higher mathematics knowledge is carried out.