若2x+3y=2010,则代数式2(3x-2y)-(x-y)+(-x+9y)=( )

问题描述:

若2x+3y=2010,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*2010
=4020