a²-3a+1=0
a²+1=3a
(a²+1)×1/a=3a×1/a
a²×1/a+1×1/a=3
a+(1/a)=3
[a+1(/a)]²=3²
a²+2×a×1/a+(1/a²)=9
a²+2+(1/a²)=9
a²+(1/a²)=9-2=7
(a^4+1)/a²=a^4/a²+1/a²
=a²+(1/a²)
=7
a²/(a^4+1)=1/7
a²-3a+1=0
a²+1=3a
(a²+1)×1/a=3a×1/a
a²×1/a+1×1/a=3
a+(1/a)=3
[a+1(/a)]²=3²
a²+2×a×1/a+(1/a²)=9
a²+2+(1/a²)=9
a²+(1/a²)=9-2=7
(a^4+1)/a²=a^4/a²+1/a²
=a²+(1/a²)
=7
a²/(a^4+1)=1/7