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战巡 发表于 2022-10-9 10:58 \[a_{n}=2\cos(\arccos(\frac{a_1}{2})\cdot 2^{-n+1})\]
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guanmo1 发表于 2022-10-9 11:46 过程呢,谢谢。
战巡 发表于 2022-10-9 21:26 没过程,一眼看出的
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2025-7-15 14:24 GMT+8
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