x三次方减去7x加上6.化简.
问题描述：
x三次方减去7x加上6.化简.
答
x^3-7x+6
=x^3-x-(6x-6)
=x(x^2-1)-6(x-1)
=x(x+1)(x-1)-6(x-1)
=(x-1)(x^2+x-6)
=(x-1)(x-2)(x+3)