在數列 1, 1/2, 1/3, 1/4, 1/5, ..., 1/n, ...... 中找出 2025 項。
而這2025項恰好是等差數列
在數列 1, 1/2, 1/3, 1/4, 1/5, ..., 1/n, ...... 中找出 2025 項。
而這2025項恰好是等差數列
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試解
-monseigneur-
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11/10/2025 postreply
19:37:08
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厲害
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11/11/2025 postreply
06:38:51
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等比子數列反而很容易找
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11/11/2025 postreply
06:40:09
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