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設四個數為a-3d,a-d,a+d,a+3d,據題意得可得(a-3d)2+(a-d)2+(a+d)2+(a+3d)2=94,故有2a2+10d2=47.①又(a-3d)(a+3d)=(a-d)(a+d)-18,可得8d2=18,解得d=±32.代入①得a=±72,故所求四數為8,…
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