2(x-2y)-6(x-2y)+3(x-2y)合并同类项

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2(x-2y)-6(x-2y)+3(x-2y)合并同类项2(x-2y)-6(x-2y)+3(x-2y)合并同类项2(x-2y)-6(x-2y)+3(x-2y)合并同类项原式=(2x-4y)-(6x-1

2(x-2y)-6(x-2y)+3(x-2y)合并同类项
2(x-2y)-6(x-2y)+3(x-2y)合并同类项

2(x-2y)-6(x-2y)+3(x-2y)合并同类项
原式=(2x-4y)-(6x-12y)+(3x-6y)=2x-4y-6x+12y+3x-6y=2y-x

-1(X-2Y)