
X^3-12X^2+21X-10=0怎么解?
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x^3-12x^2+21x-10=0
(x^3-12x^2+20x)+(x-10)=0
x(x^2-12x+10)+(x-10)=0
x(x-2)(x-10)+(x-10)=0
(x-10)[x(x-2)+1]=0
(x-10)(x^2-2x+1)=0
(x-10)(x-1)^2=0
解得:
x=10 或 x=1
(x^3-12x^2+20x)+(x-10)=0
x(x^2-12x+10)+(x-10)=0
x(x-2)(x-10)+(x-10)=0
(x-10)[x(x-2)+1]=0
(x-10)(x^2-2x+1)=0
(x-10)(x-1)^2=0
解得:
x=10 或 x=1
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