下列变形正确的是( )A.-x+yx-y=-x-yx+yB.-x+y-x-y=...
下列变形正确的是()A.-x+yx-y=-x-yx+yB.-x+y-x-y=-x-yx+yC.-x+y-x-y=x+yx-yD.-x+y-x-y=x-yx+y...
下列变形正确的是( )A.-x+yx-y=-x-yx+yB.-x+y-x-y=-x-yx+yC.-x+y-x-y=x+yx-yD.-x+y-x-y=x-yx+y
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