貌似還有排列組合。但是高考1977數學題沒有涉及，老師也沒講。

來源: 大江川於 2020-10-21 21:24:06 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.