我们在生活中经常会遇到各种相反意义的量。比如:在记账时,有时有余有时有亏;在计算粮仓存粮时,有时要记进粮,有时要记出粮。为了方便,人们就用正负来表示这些具有相反意义的量。据史料记载,早在两千多年前,中国就有了正负数的概念,掌握了正负数的运算法则。中国三国时期的学者刘徽首先给出了正负数的 We often encounter in the opposite sense of the amount of each. For example: in accounting, there are sometimes sometimes I have deficit; in the calculation of grain storage grain, sometimes to record into the grain, and sometimes to remember the grain. For convenience, people use positives and negatives to indicate these amounts of opposite significance. According to historical records, as early as two thousand years ago, China had the concept of positive and negative, mastered the algorithm of positive and negative numbers. Liu Hui, a scholar in China’s Three Kingdoms period, first gave positive and negative numbers