難倒不難，就是最後一問有點繞

來源: 15少於 2023-03-25 17:33:40 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

5≤d≤8，不是相對於同一個M而言

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