问:为什么要学习负数?答:学习负数是为了计算(如3-7=?)的需要和表示现实生活中具有相反意义的量.小学里我们可以计算8-5=3,但要计算5-8就无法进行了,引入负数后这种计算就十分简单.在现实生活中存在着大量具有相反意义的量,如通常状况下水结冰时的温度记为0℃,比0℃高 Q: Why do you want to learn negative numbers? A: Learning negative numbers is to calculate the need (such as 3-7=?) and to represent the amount that has opposite meaning in real life. In elementary schools, we can calculate 8-5=3 but calculate 5 -8 can not be carried out, after the introduction of negative numbers this calculation is very simple. In real life there is a large amount of the opposite meaning of the amount, such as the usual condition of the water when the temperature is recorded as 0 °C, higher than 0 °C