x^n+1-3n+2x^n-1(n>1)

问题描述:

x^n+1-3n+2x^n-1(n>1)
x^n+1-3x^n+2x^n-1(n>1)

原式=x^(n-1)(x²-3x+2)
=x^(n-1)(x-1)(x-2)