i dn't know how to do part b
更新1:
題目幅圖係: http://upload.lsforum.net/users/public/h30182RWb14.png
題目幅圖係: http://upload.lsforum.net/users/public/h30182RWb14.png
收錄日期: 2021-04-22 00:51:59
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100821000051KK00548