三棱錐A-BCD，求證：角BAC 小於角BAD和角CAD的和。

來源: 羅擊於 2024-02-29 19:16:03 [舊帖] [給我悄悄話] 本文已被閱讀：次

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三棱錐A-BCD，求證：角BAC 小於 角BAD和角CAD的和。