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即x1²;+x2²;=ab²;=5 x1+x2=2a+1 x1x2=2a 所以x1²;+x2²; =(x1+x2)²;-2x1x2 =4a²;+4a+1-4a =4a²;+1=5 a²;=1 a=±1 因為邊長大於0 則x1x2=2a>0 所以a=1
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