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§2.7.1 对数 ( 二 )

§2.7.1 对数 ( 二 ). 教学目标. 1. 进一步熟悉对数定义与幂的运算性质 2. 理解对数的运算性质的推导过程 . 3. 熟悉对数的运算性质的内容 . 4. 熟练运用对数的运算性质进而化简求值 . 5. 明确对数运算性质与幂的运算性质的区别. 1. 基本性质 : 若 a>0 且 a≠ １ ,N>0, 则 2. 常用性质 : 若 a>0 且 a≠ １ , 则 (1)log a 1=0 (2)log a a=1 3. 运算性质 : 若 a>0 且 a≠ １ ,M>0,N>0, 则. 例 3. 求下列各式的值.

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§2.7.1 对数 ( 二 )

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  1. §2.7.1对数(二)

  2. 教学目标 1.进一步熟悉对数定义与幂的运算性质 2.理解对数的运算性质的推导过程. 3.熟悉对数的运算性质的内容. 4.熟练运用对数的运算性质进而化简求值. 5.明确对数运算性质与幂的运算性质的区别.

  3. 1.基本性质:若a>0且a≠１,N>0,则 2.常用性质:若a>0且a≠１,则 (1)loga1=0 (2)logaa=1 3.运算性质:若a>0且a≠１,M>0,N>0,则

  4. 例3.求下列各式的值 (1)log0.41 (2)log2(47×25) (3)lg

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