《孙子算经》是唐初作为“算学”教科书的著名的《算经十书》之一,共三卷,上卷叙述算筹记数的制度和乘除法则;中卷举例说明筹算分数法和开平方法,都是了解中国古代筹算的重要资料;下卷收集了一些算术难题,“鸡兔同笼”问题是其中之一。原题如下:今有雉(鸡)兔同笼,上有三十五头,下有九十四足。问雉、兔各几只?答案:设头数是a,足数是b。则b/2一a是 The Book of Supremacy of Sun Tzu is one of the famous “Book of Sunshine 10” in the early Tang Dynasty as a textbook of “maths”, a total of three volumes, the first volume describes the system of counting and calculating multiplication and division rules; Law and Kaiping methods are all important materials for understanding ancient Chinese planning. The next volume collects some arithmetic problems. The problem of “chicken and rabbit with cage” is one of them. The original questions are as follows: There are pheasants (chickens) rabbits in the cage, there are thirty-five head, there are ninety-four feet. Asked pheasant, rabbit a few? Answer: set the number of heads is a, the number is b. Then b / 2 a is