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

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

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

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

4008,将括号全去掉变成6x-4y-x+y-x+9y=4x+6y=2(2x+3y)=4008

先去括号,再合并同类项,得4X+6Y就是2(2X+3Y),得出得数是2004*2=4008