今日有人問呢條數學 Core 的 A.S. 數 Q: It is given that 3 positive integers form an arithmetic sequence. Fi...

史丹福聽日去旅行，暫時唔更新呢度啦 :p 去旅行之前一次過出10題問題，睇下我去完旅行返來，大家...

[Just for fun] If a^2+b^2=c^2, where a, b and c a...