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[数列] 物理题中的递推数列,求通项。

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guanmo1 posted 2022-9-19 17:36 |Read mode

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kuing posted 2022-9-19 17:45
代入不就行了,由前式有
\begin{align*}
w_{n-1}&=\frac5{2R}v_n-\frac{15}{14R}v_{n-1},\\
w_n&=\frac5{2R}v_{n+1}-\frac{15}{14R}v_n,
\end{align*}
代入后式
\[\frac5{2R}v_{n+1}-\frac{15}{14R}v_n-\frac37\left(\frac5{2R}v_n-\frac{15}{14R}v_{n-1}\right)=\frac{10}{7R}v_{n-1},\]
化简为
\[v_{n+1}=\frac67v_n+\frac{19}{49}v_{n-1},\]
下略。

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