分解因式:x^3+px^2+px+p-1

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/16 02:24:07
分解因式:x^3+px^2+px+p-1
x){b⧳<~Ϭ8c킊8# ]khTOH~ Q`PS645.-+ 5!(8 DUh_\gu Aֿ}"qQp* 8 @Xa³/,0Q [UG= Īhӎbvl Br@ŰJ4Ylt1vxMr Œ

分解因式:x^3+px^2+px+p-1
分解因式:x^3+px^2+px+p-1

分解因式:x^3+px^2+px+p-1
x^3+px^2+px+p-1
=x³-1+p(x²+x+1)
=(x-1)(x²+x+1)+p(x²+x+1)
=(x+p-1)(x²+x+1)

x^3+px^2+px+p-1
=x^3-1+p(x^2+x+1)
=(x-1)(x^2+x+1)+p(x^2+x+1)
=(x^2+x+1)(x+p-1)

【思路
x^3+px^2+px+p-1=0
x^3-1=-p(x^2+x+1)
(x-1)(x^2+x+1)=-p(x^2+x+1)
【则
x^3+px^2+px+p-1
=(x-1+p)(x^2+x+1)

=x^3-1+p(x^2+x+1)
=(x-1)(x^2+x+1)+p(x^2+x+1)
=(x-1+p)(x^2+x+1)

=(x^3-1^3)+p(x^2+x+1)
=(x-1)(x^2+x+1)+p(x^2+x+1)
=(x^2+x+1)(x-1+p)