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因為成等差數列,所以 設三個數為a-d,a,a+d 所以 a-d+a+a+d=15① (a-d)²;+a²;+(a+d)²;=83② 由①,得 3a=15 a=5 由②,得 3a²;+2d²;=83 2d²;=83-75=8 d²;=4 即d=2或-2 所以 三個數為:3,5,7 或7,5,3.
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