例如帕老師問，生一個小孩是ABCD的概率是多少？學生就知道問題裏有個隱藏的條件。

來源: Shubin 於 2024-02-08 06:49:34 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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