因式分解..
1)4x^2-y^2
2) (r+s)^2-4
3)r^2-rs+ps-pr
4)z^2-8z+16
中4maths 問題
2008-09-08 7:32 am
回答 (1)
2008-09-08 7:43 am
✔ 最佳答案
1)4x^2-y^2=(2x)^2 -y^2
=(2x+y)(2x-y)
2) (r+s)^2-4
=[(r+s)+2][(r+s)-2]
=(r+s+2)(r+s-2)
3)r^2-rs+ps-pr
=r(r-s)-p(r-s)
=(r-s)(r-p)
4)z^2-8z+16
=z^2-2(4)(z)+(4)^2
=(z-4)^2
收錄日期: 2021-04-13 16:30:43
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080907000051KK03170