這個可以推導，也可以算出，推導可借對數，硬算，可借公式，或窮舉。

來源: 大江川於 2015-12-28 17:44:42 [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.