枚举法（穷举法）

“笨人之法”： 把所有可能的情况一一测试，筛选出符合条件的各种结果进行输出。

【例一】百元买百鸡:用一百元钱买一百只鸡。已知公鸡5元/只,母鸡3元/只,小鸡1元/3只。

分析：

这是个不定方程——三元一次方程组问题（三个变量，两个方程）

x＋y＋z=100

5x＋3y＋z/3=100

设公鸡为x-enumeration method (exhaustive) "Benren Regulation" : all possible test of January 1, and selected eligible for the results output. Cases -- 100 yuan to buy a 100 chicken : 100 yuan to buy 100 chickens. Known rooster 5 yuan / only, the hen 3 yuan / only and chicken one yuan / 3. Analysis : This is a volatile equation -- Group 3 linear equation (3 variable, equation 2) x + y + z = 100 5x +3 y + z / 3 = 100 x located rooster