(通用版)2020高考数学一轮复习2.5函数的图象课件文.ppt

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函数的图象,第,五,节,课前自修区 基础相对薄弱,一轮复习更需重视 基础知识的强化和落实,课堂讲练区 考点不宜整合太大,挖掘过深 否则会挫伤学习的积极性,课时跟踪检测,课,前,自,修,区,一、基础知识批注理解深一点,二、常用结论汇总规律多一点,三、基础小题强化功底牢一点,课,堂,讲,练,区,考点一 作函数的图象,描点法,图象变换法,直接法,当上面两种方法都失效时,则可采用描点法为了通过描少量点,就能得到比较准确的图象,常常需要结合函数的单调性、奇偶性等性质作出,变换包括:平移变换、伸缩变换、对称变换、翻折变换图象变换的口诀如下 图象变换有谁知?平移反射和位似; 平移左加与右减,上下移动值增减; 反射就是轴对称,上下左右玩对称; 位似缩小与放大,有个定点叫中心.,当函数表达式(或变形后的表达式)是熟悉的基本初等函数时,就可根据这些函数的特征直接作出,考点二 函数图象的识辨,考点三 函数图象的应用,谢谢观看,

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