x(x-3)(2x+1)(x-1)(x三次方-1)≤0

问题描述:

x(x-3)(2x+1)(x-1)(x三次方-1)≤0
那个(x三次方-1)要怎么降次?
越快越好,

X^3-1=(x-1)(x^2+x+1),