论文部分内容阅读
在有理数的学习中,概念的学习非常重要,它是学好中学数学的起点,下面我们一起认识一下有理数的相关概念。一、负数像-3、-4.5、-2.7%这样在正数前面加上“-”的数叫作__。温馨提示:正数前面的“+”可以省略,如+3前面的“+”可以省略;负数前面的“-”不能省略。正数和负数是相对而言的,取决于作为基准的量.如收入为正,支出为负;零上为正,零下为负;高出海平面为正,低于海平面为负。
In the study of rational numbers, the concept of learning is very important, it is a good starting point for learning mathematics in high school, let us know the relevant concepts of rational numbers. First, the negative figures like -3, -4.5, -2.7% So in the positive before the “-” number called __. Tips: positive in front of the “+” can be omitted, such as +3 in front of the “+” can be omitted; “” in front of the negative can not be omitted. Positive and negative numbers are relative, depending on the amount used as a benchmark. If income is positive, spending is negative; zero is positive and minus minus is negative; altitude above sea level is positive and below sea level is negative.