有幾條數學唔識做,邊個可以教我呀!=.=

2006-10-15 6:29 am
因式分解:
1)(4a-6b)^2+3a-2hb=?
2)5(a-b)^3-10(b-a)^2=?

回答 (2)

2006-10-15 6:43 am
✔ 最佳答案
1) (4a-6b)^2
=(4a-6b)(4a-6b)+3a-2hb
=16a^2-48ab+36b^2+3a-2hb

2)5(a-b)^3-10(b-a)^2
=5(a^2-2ab+b^2)(a-b)-10(b^2-2ab+a^2)
=5(a^3-2a(^2)b+b^3-10b^2+20ab-10a^2
=5a^3-10a(^2)b+5b^3-10b^2+20ab-10a^2
=5a^3-10a^2+20ab-10a(^2)b-10b^2+5b^3
2006-10-15 6:38 am
1)(4a-6b)^2+3a-2hb
多在個h....不能因式分解

2)5(a-b)^3-10(b-a)^2
= 5(a-b)^3-10(a-b)^2
= 5(a-b)^2 [(a-b)-2]
= 5(a-b)^2 (a-b-2)


收錄日期: 2021-04-12 18:08:49
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061014000051KK06243

檢視 Wayback Machine 備份