6a^2-a-1
12y^2+7y+1
18-7m-m^2
6p^2+p-35
thanks!!!
收錄日期: 2021-05-01 15:53:57
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20120526174239AAsDdPK