數學的直接作用確實看不出很多，但間接作用就不得了了，訓練了腦子的邏輯思維，step by step，

來源: 華府采菊人於 2025-09-15 09:29:12 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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