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設中間是x 則設為x-a,x,x+a (x-a)+x+(x+a)=15 3x=15 x=5 (x-a)²;+x²;+(x+a)²;=83 3x²;+2a²;=83 2a²;=83-75=8 a=±2 所以三個數是3,5,7或7,5,3
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