一定要有列式
1. x(x+2)-(x+2)
2. (s+1)t-1-s
3. 3(a-b)(3r-t)+9(b-a)(2t-5s)
有幾條maths想問..
2009-10-01 10:15 pm
回答 (2)
2009-10-01 10:55 pm
✔ 最佳答案
1. x(x+2)-(x+2)=x(x+2)-1*(x+2)
=(x+2)(x-1)
2. (s+1)t-1-s
=(s+1)t-(1+s)
=(s+1)(t-1)
3. 3(a-b)(3r-t)+9(b-a)(2t-5s)
=3(a-b)(3r-t)-9(a-b)(2t-5s)
=3(a-b)(3r-t)-3(a-b)*3(2t-5s)
=3(a-b)[(3r-t)-3(2t-5s)]
=3(a-b)(3r+15s+7t)
2009-10-01 11:54 pm
1) x(x+2)-(x+2)
=x二次方+2x-x+2
2) (s+1)t-1-s
=st+t-1-s
3) 3(a-b)(3r-t)+9(b-a)
=3(3ra-at-3rb+bt)+9b-9a
=9ra-3at-9rb+3bt+9b-9a
=x二次方+2x-x+2
2) (s+1)t-1-s
=st+t-1-s
3) 3(a-b)(3r-t)+9(b-a)
=3(3ra-at-3rb+bt)+9b-9a
=9ra-3at-9rb+3bt+9b-9a
收錄日期: 2021-04-23 20:02:37
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20091001000051KK00832