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战巡 发表于 2022-5-21 22:53 这其实就是卡西尼性质(Cassini Identity)的推论,既对斐波那契数列,有 \[F_{n-1}F_{n+1}-F_n^2=(-1)^n\] ...
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baxiannv 发表于 2022-5-21 23:46 这是用归这是用归纳法做的吗
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