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(a+b+c)²;=[(a+b)+c]²;=(a+b)²;+2(a+b)c+c²;=a²;+2ab+b²;+2ac+2bc+c²;=a²;+b²;+c²;+2ab+2bc+2ac然後移項就是2ab+2bc+2ac=-(a²;+b²;+c²;)
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