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設三個數為x - d,x,x + d(d≠0).三數和= x - d + x + x + d = 3x = 6.所以x = 2.數列為2 - d,2,2 + d.又因為適當排列後能成等比,所以3個數都可能是等比中項,分別計算之.(1)如果2 - d是等比中項,那麼(2 - d)…
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