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依題意設這個數列為a-d、a,a+d.於是可得a-d+a+a+d=18,且(a-d)2+a2+(a+d)2=116.解得a=6,d=2 ;或 ;a=6 ;d=-2,所以這三個數為4,6,8.故答案為:4,6,8.
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