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2(x-2y)^2-4(x-2y)+(x-2y)^2-3(x-2y),其中x-2y=-1
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1.计算:(2x-y)^2-3(2x-y)-4(2x-y)^2+(2x-y),其中2x-y=-2.
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求值(x-2y)²-4(x-2y)+2(x-2y)²-3(x-2y),其中x=-1,y=2分之1