1.
x以每枝$(x+2)買了(x+2)枝花
2.
y以每枝$(x-3)買了(x+3)枝花
收錄日期: 2021-04-25 17:20:59
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080717000051KK01744