经典题目：有100文钱，要买100只鸡，公鸡5文一只，母鸡3文一只，小鸡三只一文，问公鸡母鸡小鸡各多少只？
#/usr/bin/python #-*-encoding:utf-8-*- # x + y + z = 100 # 5x + 3y + z/3 = 100 for x in range(1, 20): for y in range(1, 33): z = 100 - y - x if z % 3 == 0 and 5 * x + 3 * y + z / 3 == 100: print ‘公鸡：‘, x, ‘只‘, ‘母鸡：‘, y, ‘只‘, ‘小鸡：‘, z, ‘只‘
原文：http://www.cnblogs.com/yytec/p/6696931.html