Ответ: 1.a-b+(-b+a)=a-b-b+a=2a-2b
2.a-b-(-b+a)=a-b+b-a=0
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Ответ: 1.a-b+(-b+a)=a-b-b+a=2a-2b
2.a-b-(-b+a)=a-b+b-a=0