Question

函数数学题请教

Answer 1

1).2.2*x+2.1y+2*(20-x-y)=42
2x+y=20
2≤x≤16
(2).w=2.2x*6+2.1y*8+2*(20-x-y)*5
=13.2x+16.8y+200-10x-10y
=3.2x+6.8y+200
由(1)式改纤有y=20-2x代迟歼掘入(2)式，w=3.2x+6.8(20-2x)+200
=3.2x+136-13.6x+200
=336-10.4x
2≤x≤16
所以x取值为2时，利润最码核大，y=315.2
（百万)
则A=2,B=16,C=2

Answer 2

(1).2.2*x+2.1y+2*(20-x-y)=42
2x+y=20
2≤x≤16
(2).w=2.2x*6+2.1y*8+2*(20-x-y)*5
=13.2x+16.8y+200-10x-10y
=3.2x+6.8y+200
由(1)式有y=20-2x代入(2)式尘祥，派卖搏w=3.2x+6.8(20-2x)+200
=3.2x+136-13.6x+200
=336-10.4x
2≤x≤16
所配哪以x取值为2时，利润最大，y=315.2
（百万)