x^3-3*x+2=0怎么解

x^3-3x+2=0 x(x^2-1)-2(x-1)=0 x(x+1)(x-1)-2(x-1)=0 (x^2+x-2)(x-1)=0 (x+2)(x-1)(x-1)=0 解得：x1=x2=1；x3=-2