用因式分解法解下列各方程
2. 2x2 - 5x - 3 = 0
3. 25x2 - 10x + 1 = 0
4. 4x2 + 16 + 20x = 0
用取平方根法解下列各方程
(如有需要,取答案准至二位小數)
5. (2y - 3)2 = 8
6. 25/9 = (y - 4/3)2
7. (y + 2.5)2 = 3.25
急,大家可唔可以教吓我解方程啊8
2008-09-07 6:27 am
回答 (1)
2008-09-07 4:40 pm
✔ 最佳答案
As follow AS~~~圖片參考：http://www.photo-host.org/img/410509screenhunter_08_sep._07_08.36.gif
2008-09-07 08:40:50 補充：
7.
y=-2.5正負開方(3.25)
收錄日期: 2021-04-23 20:34:37
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080906000051KK03023