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設3個數為 a-d,a,a+d 所以 a=15÷3=5 從而 (5-d)²;+5²;+(5+d)²;=83 25×3+2d²;=83 d²;=4 d=2或-2 所以 三個數為:3,5,7;或7,5,3.
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