已知:
a*b = 3×a-b
so:
12*5 = ?
* = 一個未知的運數附? --- + - × ÷
收錄日期: 2021-04-13 15:39:48
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080603000051KK02448