2018年高中数学第一章导数及其应用1.3.2利用导数研究函数极值课件8新人教B版选修2_2.ppt

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利用导数研究三次函数,y=2x+1,y=x2-2x-3,y=x3-4x2+4x,利用导数研究三次多项式函数,问题一:如何利用导数研究函数 的单调性?,问题二:你还记得如何利用导数求函数的极值吗?,问题三: 如何利用导数 求函数 在【a,b】的最值?,x,y,o,2,开口朝上,开口朝下,开口朝上,开口朝上,开口朝下,开口朝下,在全体实数范围内,三次多项式函数的图像具有以下特点:,知识检测,1、已知函数在(,+)上是增函数, 则m的取值范围是 ( ) Am4或m2 B4m2 C2m4 Dm2或m4,2、若函数y=x3+bx有三个单调区间,则b的取值范围是_.,3、函数f(x)=x36bx+3b在 (,+)既有极小值又有极大值,则b的取值范围是多少?,数形本是相倚依,焉能分作两边飞; 数缺形时少直觉,形少数时难入微; 数形结合百般好,割裂分家万事非。_ 华罗庚,

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