唔該幫下我. thz very much ,
圖片參考:http://i692.photobucket.com/albums/vv290/alittlefork/math4.jpg
收錄日期: 2021-04-24 10:12:18
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090830000051KK02416