九章算术是一部後汉时期(公元25年到219年)编纂的数学问题集,二百四十六个问题都分别指示出解题的方法。九章算术的第七章叫“盈不足”,裹边有二十个问题都是用盈不足术来解决。这个盈不足术在中国数学史上是—种原始的解题方法,不为後来的数学家十分重视。但是它流传到西洋以後,却有它的辉煌的发展过程,在世界数学史上有着光荣的地位。九章算术盈不足章开宗明义的第—问是:“今有(人)共买物:人出八(钱),盈三(钱);人出七 Nine chapters of arithmetic is a set of mathematics problems compiled by the late Han Dynasty (AD 25 to 219). The 246 questions each indicate the method of solving problems. The seventh chapter of the nine chapters of arithmetic is called “insufficiency,” and there are twenty problems in the edge. This deficiency is an original problem solving method in the history of Chinese mathematics. It is not paid much attention by later mathematicians. However, after its spread to the Western Ocean, it has its brilliant development process and has a glorious position in the history of the world’s mathematics. Nine chapters of arithmetic and insufficiency are the first chapters to open the meaning of the righteousness - the question is: "Today there are (people) to buy things: people out of eight (money), surplus three (money); person out of seven