X^3-2X^2+X^2-3X+2=0X^2(X-2)+(X-1)(X-2)=0(X-2)(X^2+X-1)=0X=0,X2,3=(-1±√5)/2
x3-x2-3x+2=0(x^3-x^2-2x)-(x-2)=0x(x+1)(x-2)-(x-2)=0(x-2)(x^2+x-1)=0x=2x^2+x-1=0x=(-1+-根号5)/2
x³-x²-3x+2=(x-2)(x²+x-1)=0解x=2或(-1±√5)/2