x³-3x+2=0x³-1-3x+3=0(x-1)(x²+x+1-3)=0(x-1)(x²+x-2)=0(x-1)²(x+2)=0∴x=1 或x=-2
零点就是满足f(x)=0的x f(x)=x^3-3x+2=x^3-x-2x+2=(x^3-x)-2(x-1) =x(x+1)(x-1)-2(x-1)=(x^2+x-2)(x-1)=(x+2)(x-1)(x-1)=0 则x=1或x=-2 就是所求的零点
-2