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敢えて別解
3x³+6x²-3x+2=3(x-‪α‬)(x-β)(x-γ)
この式にx=1を代入して
3+6-3+2=3(1-‪α‬)(1-β)(1-γ)
∴(‪α‬-1)(β-1)(γ-1)=-8/3

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