因为x^2-3x+1=0
所以x^2=3x-1
x^4+x^2+1=(3x-1)^2+x^2+1
=9x^2-6x+1+x^2+1
=10x^2-(6x-2)
=10x^2-2(3x-1)
=10x^2-2x^2
=8x^2
所以结果为x^2/(8x^2)=1/8