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a(a-1)-(a²;-b)=4 a²;-a-a²;+b=4 b-a=4 則: [(a²;+b²;)/2]-ab =[(a²;+b²;)-2ab]/2 =[a²;-2ab+b²;]/2 =(a-b)²;/2 =(b-a)²;/2 =8
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