4x + 36xy + 81y^2 - 49
因式係咩?
中三數學題
2007-10-02 2:01 am
回答 (3)
2007-10-02 2:50 am
✔ 最佳答案
4x + 36xy + 81y^2 - 49=(2x+9y)^2 - 7^2
=(2x+9y+7)(2x+9y-7)
2007-10-02 2:11 am
4x (9y + 1) + (9y - 7) (9y + 7)
2007-10-02 2:04 am
4(x+9xy)+81y^2-49
因式係4掛
因式係4掛
收錄日期: 2021-04-16 14:08:27
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071001000051KK04113