(A+B)^2 - (A-B)^2
列埋式,,thx!!
一條數...唔該!!thx@@
2008-08-13 4:59 am
回答 (1)
2008-08-13 5:58 am
✔ 最佳答案
(A+B)^2 - (A-B)^2=A^2+2AB+B^2-(A^2-2AB+B^2)
=A^2+2AB+B^2-A^2+2AB-B^2
=4AB
收錄日期: 2021-04-22 00:38:40
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080812000051KK02849