x^3-2x^2-x+2=0(该怎么分解,
问题描述:
x^3-2x^2-x+2=0(该怎么分解,
答
x^3-2x^2-x+2
=x²(x-2)-(x-2)
=(x-2)(x²-1)
=(x-2)(x-1)(x+1)