《常用对数》原是初中代数第三册的内容,去年秋季起,人民教育出版社把它移到初中代数第四册来教学,这对调整初中数学的教学内容,加强基础,培养能力是大有好处的。这一单元的教学目的和要求主要是,正确理解对数的概念;熟练掌握积、商、幂、方根的对数的运算法则;能用对数和反对数表熟练地进行对数计算。《常用对数》是初中代数的重点和难点教材之一。笔者试图就如何从这一单元的教学目的和要求出发,切实抓好这个重点,突破这个难点,谈谈肤浅的认识和体会。关于对数概念的教学。这是这一单元教学的关键,必须 “Common logarithm” was originally the content of the third book of junior high school algebra. Since last fall, People's Education Publishing House has moved it to the fourth book of junior high school algebra to teach, which is to adjust the junior high school mathematics teaching content, strengthen the foundation and cultivate the ability Great for you. The teaching aims and requirements of this unit are mainly to correctly understand the concept of logarithm; to master the algorithm of logarithm of product, quotient, power and square root; and logarithmically to calculate logarithmically and logarithmically. “Common logarithm” is one of the key and difficult teaching materials of junior high school algebra. The author attempts to start from the teaching purpose and requirement of this unit, earnestly grasp this important point, break through this difficult point, and talk about the superficial understanding and experience. Teaching about the concept of logarithm. This is the key to teaching this unit, you must