D2n=a2D2n-2-b2D2n-2=(a2-b2)D2n-2=…=(a2-b2)n.

admin2022-11-03  13

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答案D2n=a2D2n-2-b2D2n-2=(a2-b2)D2n-2=…=(a2-b2)n

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