x³-3x+2=0
x³-x-2x+2=0
x(x²-1)-2(x-1)=0
x(x+1)(x-1)-2(x-1)=0
(x-1)(x²+x-2)=0
(x-1)(x+2)(x-1)=0
(x-1)²(x+2)=0
x=1或x=-2
X^3-3X+2=0
x³-x²+x²-3x+2=0
x²﹙x-1﹚+﹙x-1﹚﹙x-2﹚=0
﹙x-1﹚﹙x²+x-2﹚=0
﹙x-1﹚²﹙x+2﹚=0
x=1, x=-2
解:x³-3x+2=0
x³-x²+x²-3x+2=0
x²(x-1)+(x-1)(x-2)=0
(x-1)(x²+x-2)=0
(x-1)(x-1)(x+2)=0
( x-1)²(x+2)=0
所以:( x-1)=0 解得 x=1
(x+2)=0 解得 x=-2
X^3-3X+2=0
x(x-1)^2+(2x^2-4x+2)=x(x-1)^2+2(x-1)^2=(x+2)(x-1)^2
(x-1)(x-2)=0
x=1,x=2