x^3-5x^2+x+10 =x^3-4x^2+4x-x^2-3x+10 =x(x-2)^2-(x^2+3x-10) =(x-2)(x^2-2x)-(x-2)(x+5) =(x-2)(x^2-3x-5) =(x-2)(x^2+mx+n). 所以:m=-3 n=-5