对数运算是一种重要的初等超越运算,初中学生感到比较困难。要提高对数运算能力,除掌握对数的定义、性质及运算法则外,还要对对数运算法则正反两个方向的变换能灵活运用,并具备一定的代数运算技巧。结合已学知识,总结、归纳出各种不同类型的习题,让同学们研究,这对于学生知识系统化、条理化,培养其正确而迅速的运算能力是十分必要的。下面是教学的点滴体会。文中各种类型的例题只对少数难度稍大的作略解。一、利用对数的定义进行计算对数的定义说明了两个问题:一是对数的 Logarithmic computing is an important primary transcendental operation, and junior high school students feel more difficult. To improve logarithmic computing capabilities, in addition to the definition of the logarithm, the nature and algorithms, but also to the logarithm of the positive and negative direction of the algorithm can be used in two-way transformation, and have some algebraic operations skills. Combining learned knowledge, summarizing and summarizing various types of exercises to allow students to study, it is necessary for students to systematize, organize, and develop their correct and rapid computing power. The following is a bit of experience in teaching. Various types of examples in the text only slightly solve a few of the more difficult. First, the use of the definition of the logarithm to calculate the definition of the logarithmic description of two issues: First, the logarithm