因式分解x^3-9x^2+27x-27
问题描述:
因式分解x^3-9x^2+27x-27
要步踌
答
x^3-9x^2+27x-27
=(x^3-3x^2)-(6x^2-18x)+(9x-27)
=x^2(x-3)-6x(x-3)+9(x-3)
=(x^2-6x+9)(x-3)
=(x-3)^3