这个太简单了！昨晚我看娃的一道排列组合题，简单的阶乘，我居然没在A BCD里找到答案！我决心回家好好做数学题面壁去！！

来源: kirn 于 2022-04-30 13:52:04 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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