遞迴數列
\( (n+1)a_n=2a_{n-1}+(n-1) \),\( n=2,3,4,... \),\( a_3=5 \),求\( a_n \)? 先給答案\( \displaystyle a_n=\frac{96 \times 2^{n-3}}{(n+1)!}+1 \)
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回復 2# bugmens 的帖子
好厲害,如何算的?回復 3# rudin 的帖子
\(\left(n+1\right)a_n = 2a_{n-1}+\left(n-1\right)\)\(\Rightarrow \left(n+1\right)a_n = 2\left(a_{n-1}-1\right)+\left(n+1\right)\)
\(\Rightarrow \left(n+1\right)\left(a_n -1\right) = 2\left(a_{n-1}-1\right)\)
後面用「累乘法」~
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