把x-y,合并同类项:5(x-y)+3(x-y)-7(x-y)=
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把x-y,合并同类项:5(x-y)+3(x-y)-7(x-y)=把x-y,合并同类项:5(x-y)+3(x-y)-7(x-y)=把x-y,合并同类项:5(x-y)+3(x-y)-7(x-y)=&nbs
把x-y,合并同类项:5(x-y)+3(x-y)-7(x-y)=
把x-y,合并同类项:5(x-y)+3(x-y)-7(x-y)=
把x-y,合并同类项:5(x-y)+3(x-y)-7(x-y)=
把x-y,合并同类项:5(x-y)+3(x-y)-7(x-y)=
把x-y看成一个整体,合并同类项:5(x-y)+3(x-y)-7(x-y)
把(x+y)、(x-y)看作整体,进行合并同类项;3(x-y)-4(x+y)+5(x-y)-(x+y).
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把(x+y)、(x-y)看作整体,进行合并同类项:3(x-y)-4(x+y)+5(x-y)-(x+y).
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把(x-y),(a+b)作为一个因式,合并同类项:3(x-y)-9(x-y)-8(x-y)+6(x-y)-1