若x^2-5x+1=0,则x^2+1/x^2=_______
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若x^2-5x+1=0,则x^2+1/x^2=_______若x^2-5x+1=0,则x^2+1/x^2=_______若x^2-5x+1=0,则x^2+1/x^2=_______x^2+1/x^2=
若x^2-5x+1=0,则x^2+1/x^2=_______
若x^2-5x+1=0,则x^2+1/x^2=_______
若x^2-5x+1=0,则x^2+1/x^2=_______
x^2+1/x^2=23
x^2-5x+1=0,则x-5+1/x=0则x+1/x=5
(x+1/x)²=x²+2+1/x²=5²
所以x²+1/x²=23
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*-----------------------------------------------*| 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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