x2y2-9z2=??
8a2-18b2=??
math??
2006-10-16 4:23 am
回答 (2)
2006-10-16 8:02 am
✔ 最佳答案
x^2y^2 -9z^2= (xy)^2 - (3z)^2
=(xy+3z).(xy-3z)
8a^2 - 18b^2
=2(4a^2-9b^2)
=2.[(2a)^2 - (3b)^2]
=2.(2a+3b).(2a-3b)
2006-10-22 02:58:12 補充：
下面那位請不要copy answer !!
2006-10-17 5:11 pm
x^2y^2 -9z^2
= (xy)^2 - (3z)^2
=(xy+3z).(xy-3z)
8a^2 - 18b^2
=2(4a^2-9b^2)
=2.[(2a)^2 - (3b)^2]
=2.(2a+3b).(2a-3b)
^^
= (xy)^2 - (3z)^2
=(xy+3z).(xy-3z)
8a^2 - 18b^2
=2(4a^2-9b^2)
=2.[(2a)^2 - (3b)^2]
=2.(2a+3b).(2a-3b)
^^
收錄日期: 2021-04-12 22:48:53
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061015000051KK05630