X^3-3X^2-5X-1=0
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X^3-3X^2-5X-1=0X^3-3X^2-5X-1=0X^3-3X^2-5X-1=0X^3-3X^2-5X-1=0(X+1)(X^2-4X-1)=0X+1=0或X^2-4X-1X=-1或X=2+
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
*-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X ||
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