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在高考试卷与模拟试题中,三次函数的问题考查经常出现,成为考试的重点。本文从求三次函数的单调区间、求三次函数的极值(或在闭区间上的最值)、求三次函数中参数的值或范围、求三次函数在某一点处的切线方程、求三次方程的根的个数五个方面介绍导数在解决三次函数问题中的应用。
Examination papers in college entrance examination and simulation questions, the test of the third function problems often appear as the focus of the exam. This article from seeking the monotonous interval of cubic function, seek the extremum of the cubic function (or the most value in the closed interval), find the value or range of the parameter in the cubic function, find the tangent equation of the cubic function at a certain point, find the cubic equation The number of roots introduced in five aspects of the derivative in solving the problem of cubic function in the application.