1 1
- 負-
1 5 0 3 3
(-a b )x(-b a)
3 2
=?!`有埋步驟,吾該哂!
收錄日期: 2021-04-18 23:15:48
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070825000051KK00646