問題係:
aˉ¹ - bˉ¹
-----------------
aˉ² - bˉ²
答案點解係:
ab
-------
a+b
唔該幫幫手,就黎開學.......
收錄日期: 2021-04-13 13:13:20
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070831000051KK00803