(x²+x+1)分之x=4分之1
x/(x²+x+1)=1/4
4x=x²+x+1
4=x+1+1/x
3=x+1/x
9=(x+1/x)²
9=x²+2+1/x²
8=x²+1+1/x²
8x²=x^4+x²+1
x²/(x^4+x²+1)=1/8
(x²+x+1)分之x=4分之1
x/(x²+x+1)=1/4
4x=x²+x+1
4=x+1+1/x
3=x+1/x
9=(x+1/x)²
9=x²+2+1/x²
8=x²+1+1/x²
8x²=x^4+x²+1
x²/(x^4+x²+1)=1/8