x2-5x+1=0,求x4+1/x2

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x2-5x+1=0,求x4+1/x2x2-5x+1=0,求x4+1/x2x2-5x+1=0,求x4+1/x2x^2-5x+1=0x^2+1=5x(x^4+1)/x^2=(x^2+1)^2-2x^2/x

x2-5x+1=0,求x4+1/x2
x2-5x+1=0,求x4+1/x2

x2-5x+1=0,求x4+1/x2
x^2-5x+1=0
x^2+1=5x
(x^4+1)/x^2=(x^2+1)^2-2x^2/x^2
=(5x)^2-2x^2/x^2
=23x^2/x^2
=23

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