x^3+x²-2=0
x^3-1+x²-1=0
(x-1)(x²+x+1)+(x+1)(x-1)=0
(x-1)(x²+x+1+x+1)=0
(x-1)(x²+2x+2)=0
x²+2x+2在实数范围内无法分解
x-1=0
x=1