http://img87.imageshack.us/img87/4705/mathsqv7.jpg
更新1:
答案是 20/[(√3)-1]
F.3 三角學!
2008-03-23 8:30 pm
回答 (1)
2008-03-23 8:50 pm
收錄日期: 2021-04-25 17:19:13
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080323000051KK00968