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“相反数”是初中代数“有理数”的一个重点,本文归纳有关知识,希望能帮助同学们理解“相反数”概念.一、要注意概念的完整表述,即“只有符号不同的两个数,我们说其中一个是另一个的相反数;零的相反数是零”.1.以上概念中用分号(;)隔开的两句话是一个整体.因为零没有正负,不存在符号不同的问题,所以后一句话是对前一句话的必要补充.有的同学常将后一句话漏掉,致使概念不完整.
“The opposite number ” is a key point of junior high school algebra “rational number ”, this article summarizes the relevant knowledge, hoping to help students to understand the concept of “contrary number.” One, pay attention to the complete expression of the concept, We say one of them is the opposite of the other; the opposite of zero is zero ". 1. The two sentences separated by semicolons (;) in the above concept are a whole. Because zero There is no sign of positive or negative, there is no sign of the different issues, so the last sentence is a necessary complement to the previous sentence. Some students often miss the next sentence, resulting in the concept of incomplete.