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(a-b)=a^2-2ab+b^2 =a^2+b^2-2ab =-(a^2-b^2)-2ab =-(a+b)(a-b)-2ab所以(a-b)=-(a+b)(a-b)-2ab即(a-b)=-3(a-b)-4 4=-4(a-b)所以(a-b)=-1
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