唔好直接比答案,要係教先得
1.5abc+10a2b+15bc
2.(x-y)+(2x+3xy)
3.(a-b)+(2a+2b)
收錄日期: 2021-05-02 16:50:06
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071111000051KK04434