(1)由题意得
2.2x+2.1y+2(20-x-y)=42
整理得y=-2x+20
(x=2,3,4,5)
(2)W=2.2x*6+2.1*(-2x+20)*8+2*(20-x+2x-20)=-18.4x+336
所以在x的范围内(x=2)取最大利润
所以A:2辆,B:16辆,C:2辆
(1)由题意得
2.2x+2.1y+2(20-x-y)=42
整理得y=-2x+20
(x=2,3,4,5)
(2)W=2.2x*6+2.1*(-2x+20)*8+2*(20-x+2x-20)=-18.4x+336
所以在x的范围内(x=2)取最大利润
所以A:2辆,B:16辆,C:2辆