x的三次方减去3x加2怎么解

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x的三次方减去3x加2怎么解x的三次方减去3x加2怎么解x的三次方减去3x加2怎么解x^3-3x+2=0x^3-4x+x+2=0x(x^2-4)+(x+2)=0x(x-2)(x+2)+x+2=0(x+

x的三次方减去3x加2怎么解
x的三次方减去3x加2怎么解

x的三次方减去3x加2怎么解
x^3-3x+2=0
x^3-4x+x+2=0
x(x^2-4)+(x+2)=0
x(x-2)(x+2)+x+2=0
(x+2)(x^2-2x+1)=0
(x+2)(x-1)^2=0
x=-2
x=1


x^3-3x+2=0
x^3-4x+x+2=0
x(x^2-4)+(x+2)=0
x(x-2)(x+2)+x+2=0
( x+2)(x^2-2x+1)=0
(x+2)(x-1)^2=0
x=-2
x=1