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a²;+b²;+c²;-ab-3b-2c+4=0 配方得(a-b/2)²;+(c-1)²;+3(b/2-1)²;=0 所以, a-b/2=0 c-1=0 b/2-1=0 a=1,b=2,c=1 a+b+c=1+2+1=4
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