若2x+3y=1003,则代数式2(3x-2y)-(x-y)+(-x+9y)=

问题描述:

若2x+3y=1003,则代数式2(3x-2y)-(x-y)+(-x+9y)=

2(3x-2y)-(x-y)+(-x+9y)
=6x-4y-x+y-x+9y
=4x+6y
=2(2x+3y)
=2×1003
=2006