发布网友 发布时间:2024-10-24 14:58
共2个回答
热心网友 时间:2024-10-29 17:03
729x^6-243x^4+27x^2-1
=[(9x^2)^3-1^3]-243x^4+27x^2
=(9x^2-1)(81x^4+9x^2+1)-27x^2(9x^2-1)
=(9x^2-1)(81x^4+9x^2+1-27x^2)
=(9x^2-1)(81x^4-18x^2+1)
=(9x^2-1)(9x^2-1)^2
=(9x^2-1)^3
=(3x+1)^3(3x-1)^3
热心网友 时间:2024-10-29 17:03
729x^6-243x^4+27x^2-1
=(729x^6-1)-27x^2(9x^2-1)
=((9x^2)^3-1)-27x^2(9x^2-1)
=(9x^2-1)(81x^4+9x^2+1)-27x^2(9x^2-1)
=(9x^2-1)(81x^4+9x^2+1-27x^2)
=(9x^2-1)(81x^4-18x^2+1)
=(9x^2-1)(9x^2-1)^2
=(9x^2-1)^3
=(3x+1)^3(3x-1)^3