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)=