(通用版)2020版高考数学大一轮复习第9讲对数与对数函数课件理新人教A版.pptx

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课前双基巩固课堂考点探究教师备用例题,1.理解对数的概念及其运算性质,知道用换底公式能将一般对数转化成自然对数或常用对数;了解对数在简化运算中的作用. 2.对数函数 (1)理解对数函数的概念,理解对数函数的单调性,掌握对数函数图像通过的特殊点; (2)知道对数函数是一类重要的函数模型; (3)了解指数函数y=ax(a0,且a1)与对数函数y=logax(a0,且a1)互为反函数.,考试说明,知识聚焦,x=logaN,对数,对数,0,N,logaM+logaN,logaM-logaN,nlogaM,对数,(0,+),R,(1,0),增,减,y=x,y=logax(a0且a1),对点演练,题组一 常识题,题组二 常错题,索引:对数的性质及其运算掌握不到位;忽略真数大于零致错;不能充分运用对数函数的性质;忽略对底数的讨论致误.,探究点一 对数式的化简与求值,探究点二 对数函数的图像及应用,探究点三 解决与对数函数性质有关的问题,微点1 比较大小,微点2 解简单对数不等式,微点3 对数函数性质的综合问题,应用演练,【备选理由】例1主要考查对数的运算、对数函数图像的变换;例2考查比较对数式的大小;例3主要考查复合函数的单调性以及对数函数与指数函数的性质;例4为对数函数性质的综合问题.,

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