1. 9(a^2)-49
2. 4a^7-7a^4-28a^5+a^6
3.a+f+af+fg+g+gt+ta+t+1
Identity facturization
2008-03-04 4:26 am
回答 (1)
2008-03-04 5:48 am
✔ 最佳答案
1. 9a^2-49= (3a)^2-7^2
= (3a+7)(3a-7)
2. 4a^7 - 7a^4 -28a^5 + a^6
= 4a^7 + a^6 -28a^5 - 7a^4
= a^6 (4a+1) - 7a^4 (4a+1)
= (a^6-7a^4) (4a+1)
= a^4(a^2-7)(4a+1)
3. a+f+af+fg+g+gt+ta+t+1
= a+af+ta+g+fg+gt+1+f+t
= a(1+f+t)+g(1+f+t)+(1+f+t)
= (a+g+1)(1+f+t)
收錄日期: 2021-04-23 22:25:24
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080303000051KK02501