(x-1)(x^2+mx+n)=x^3+mx^2+nx-x^2-mx-n=x^3+(m-1)x^2+(n-m)x-n
因为x^3-6x^2+11x-6=(x-1)(x^2+mx+n),
所以x^3+(m-1)x^2+(n-m)x-n=x^3-6x^2+11x-6
根据恒等式性质,得n=6,m=-5