命題1與命題2不等價啊，大師。一個是原命題，一個是逆命題。是你們推導錯誤，而導致它們看起來等價。

來源: 清溢於 2023-12-29 23:20:10 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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