已知x+1/x=3,求(xx)/(xxxx+xx+1)的值
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已知x+1/x=3,求(xx)/(xxxx+xx+1)的值已知x+1/x=3,求(xx)/(xxxx+xx+1)的值已知x+1/x=3,求(xx)/(xxxx+xx+1)的值(xx)/(xxxx+xx
已知x+1/x=3,求(xx)/(xxxx+xx+1)的值
已知x+1/x=3,求(xx)/(xxxx+xx+1)的值
已知x+1/x=3,求(xx)/(xxxx+xx+1)的值
(xx)/(xxxx+xx+1)
=x^2/(x^4+x^2+1)
=1/x^2+1+x^2
=x^2+1/x^2+2-1
=(x+1/x)^2-1
=3^2-1
=8
(x^4+x^2+1)/x^2
=x^2+1+1/x^2
=(x+1/x)^2-1
=3^2-1
=8
所以x^2/(x^4+x^2+1)=1/8
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