x^2-6x+1=0
因为把x=0代入不成立,所以x不等于0
两边同除以x
x-6+1/x=0
x+1/x=6
两边平方
x^2+2+1/x^2=36
x^2+1/x^2=34
x^2/（x^4-x^2+1）分子分母同除以x^2
=1/(x^2-1+1/x^2)
=1/(-1+34)
=1/33