论化简,是不能再简了,
如果是计算,可能没多项式的三次运算.
-(n-1)^3
=-(n-1)^2(n-1)
=-(n^2-2n+1)(n-1)
=-(n^3-2n^2+n-n^2+2n-1)
=-(n^3-3n^2+3n-1)
=-n^3+3n^2-3n+1.化为三项式乘以二项式，合并去括号。懂了谢谢