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a的平方乘以b的平方+8ab+16+a的平方+2ab+b的平方=0 (ab+4)²;+(a+b)²;=0 ∴ab+4=0 a+b=0 ∴ab=-4 a+b=0 ∴a²;+b²;=(a+b)²;-2ab=0+8=8
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