化简:-(x-y)+2(x-y)-3(x-y)
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化简:-(x-y)+2(x-y)-3(x-y)化简:-(x-y)+2(x-y)-3(x-y)化简:-(x-y)+2(x-y)-3(x-y)-x+y+2x-2y-3x+3y=-2x+2y
化简:-(x-y)+2(x-y)-3(x-y)
化简:-(x-y)+2(x-y)-3(x-y)
化简:-(x-y)+2(x-y)-3(x-y)
-x+y+2x-2y-3x+3y
=-2x+2y
2(x-y)²-3(x-y)(-y-x)
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2分之x+y+3分之x-y;4(x+y)-(x-y)谢谢了,
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