快!明交
更新1:
(1+x^2-x)(1+x^2+x)
更新2:
plz canu teach this too
factorize:5x^2-80y^2-4x-16y
回答 (2)
2010-10-12 2:24 am
✔ 最佳答案
5x^2-80y^2-4x-16y =5(x^2 -16y^2) - 4(x+4y)=5(x-4y)(x+4y) - 4(x+4y)=(x+4y)(5x-20y -4)2010-10-11 19:10:11 補充：
(1+x^2-x)(1+x^2+x)
=(1+x^2)^2 - x^2
=x^4+2x^2+1-x^2
=x^4+x^2+1
Choose me la OK?
參考: By me
2010-10-12 4:38 am
5x^2-80y^2-4x-16y
5(x^2-16y^2)-4(x+4y)
5(x-4y)(x+4y)-4(x+4y)
(5(x-4y)-4)(x+4y)
(5x-20y-4)(x+4y)
____________________
(1+x^2-x)(1+x^2+x)
((1+x^2)-x)((1+x^2)+x)
(1+x^2)^2-x^2
1+2x^2+x^4-x^2
x^4+x^2+1
5(x^2-16y^2)-4(x+4y)
5(x-4y)(x+4y)-4(x+4y)
(5(x-4y)-4)(x+4y)
(5x-20y-4)(x+4y)
____________________
(1+x^2-x)(1+x^2+x)
((1+x^2)-x)((1+x^2)+x)
(1+x^2)^2-x^2
1+2x^2+x^4-x^2
x^4+x^2+1
收錄日期: 2021-04-19 23:24:23
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20101011000051KK00869