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A.a+(b-c)=a+b+cB.a-(b-c)=a-b-cC.a-(b-c)=a-b+cD.a+(b-c)=a-b+c
A、x+y=xyB、5x2y-4x2y=x2yC、x2+3x3=4x5D、5x3-2x3=3
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