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有理数是中学数学学习中最基本、最重要的内容之一,是进一步学习数学的基础.但同学们初学时常常因为对基本概念、性质等理解不透彻,出现许多错误.现将常见的错误总结如下,希望引起同学们的注意.一、对正数、负数概念理解不清出错例1下列各数+2 013、3.2、0、-8.1、7/8、-9、+10/3中,是正数的有____.错解:填“+2 013、+10/3”或填“+2 013、3.2、0、7/8、+10/3.剖析:主要错在没有理解正数的含义及其表示方法,误认为正数必须带”+“或认为凡
Rational number is one of the most basic and important contents in middle school mathematics learning, which is the basis for further study of mathematics.But students often begin to learn many mistakes because they do not understand the basic concepts, nature, etc. Now common mistakes are summarized The following, hoping to arouse the students’ attention.One, the concept of positive number, negative number is not clear understanding of error 1 The following number +2 013,3.2,0, -8.1,7 / 8, -9, +10 / 3, Is a positive number ____. Misinterpretation: fill ”+2 013, +10 / 3 “ or fill ”+2 013,3.2,0,7 / 8, +10 / 3. Analysis: The main fault is not Understand the meaning of positive numbers and their representation, mistaken for a positive number must be with “+ ” or that