幫手計計數學啊....
回答 (2)
2007-08-07 11:44 pm
✔ 最佳答案
( a + 2b - 3k) ^2 =(a+2b-3k)(a+2b-3k)
=a^2+2ab-3ka+2ab+4b^2-6bk-3ak-6bk+9k^2
=a^2+4b^2+9k^2+4ab-6ak-12bk
參考: me
2007-08-07 11:29 pm
( a + 2b - 3k) ^2=a^2+4b^2-9k^2+4ab
收錄日期: 2021-04-23 20:10:15
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070807000051KK02818