1. x-(y/2)=(x/2)+(y/4)=2
2. 4x-2y=2(x+y)+y=5
收錄日期: 2021-04-20 11:52:59
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20111119000051KK00509