若2x+3y=2004,则代数式2(3x-2y)-(x-y)+(-x+9y)=...

问题描述:

若2x+3y=2004,则代数式2(3x-2y)-(x-y)+(-x+9y)=...

2(3x-2y)-(x-y)+(-x+9y)= 展开得4x+6y=2(2x+3y)=2004*2=4008