学习了有理数,算术数的前面就带了正、负号,这种符号在不同场合有着不同的含义和作用,同学们往往分辨不清楚,现将这个“-”号的含义分析如下:一种含义是“负”,表示一个有理数所带的是负号,称为性质符号,如-2,-5等。一种含义是“减”,是表示运算的符号,称为减号。还有一种含义 Learned rational numbers, arithmetic numbers in front of the positive and negative sign, this symbol has different meanings and effects on different occasions, the students are often not clear, now the meaning of the “-” sign is analyzed as follows: The meaning is “negative”, which means that a rational number carries a negative number, which is called a nature symbol, such as -2, -5, and so on. One kind of meaning is “decrease”, which is a symbol that represents an operation and is called a minus sign. There is another meaning