x/x²-x+1=2;x²-3x/2+1=0;x+1/x=3/2;x²+1/x²=(x+1/x)²-2=9/4-2=1/4;x²/(x^4+x^2+1)=1/(x²+1+1/x²)=1/(1+1/4)=4/5;如果本题有什么不明白可以追问,