设:公鸡x只，母鸡y只，小鸡z只x+y+z=1008x+5y+1/3Z=100把z=100-x-y代入8x+5y+1/3(100-x-y)=100即23x+14y=200x=(200-14y)/23因x，y都是整数且小于100所以无解
