(通用版)2020高考数学一轮复习2.10对数函数课件文.ppt

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对数函数,第,十,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 对数函数的图象及应用,考点二 对数函数的性质及应用,解题方法,常见类型,常借助1,0等中间量进行比较,底数与真数都不同,可以先用换底公式化为同底后,再进行比较,底数不同,真数相同,需对底数进行分类讨论,底数为同一字母,可由对数函数的单调性直接进行判断,底数为同一常数,方法,类型,需先将b化为以a为底的对数式的形式,再借助ylogax的单调性求解,logaxb,借助ylogax的单调性求解,如果a的取值不确定,需分a1与0a1两种情况讨论,logaxlogab,二判,一求,判断内层函数和外层函数的单调性,运用复合函数“同增异减”原则判断函数的单调性,判断对数函数的底数与1的关系,分a1与0a1两种情况,求出函数的定义域,所有问题都必须在定义域内讨论,谢谢观看,

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