要step. thanks ;)
更新1:
to hhhsesa: your answer is wrong. sorry : (
更新2:
螞蟻雄兵: 對不起: ( 你的答案也錯了.
更新3:
答案一定是 (q-1)(1+q-2q^3).
to hhhsesa: your answer is wrong. sorry : (
螞蟻雄兵: 對不起: ( 你的答案也錯了.
答案一定是 (q-1)(1+q-2q^3).
收錄日期: 2021-04-23 23:18:14
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090928000051KK00893