X^3-3X^2-5X-1=0
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![X^3-3X^2-5X-1=0](/uploads/image/z/1776022-70-2.jpg?t=X%5E3-3X%5E2-5X-1%3D0)
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X^3-3X^2-5X-1=0
X^3-3X^2-5X-1=0
X^3-3X^2-5X-1=0
X^3-3X^2-5X-1=0
(X+1)(X^2-4X-1)=0
X+1=0 或 X^2-4X-1
X=-1 或 X=2+根号5 或 X=2-根号5
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