a/(a^2+a+1)=1/6
1/(a+1/a+1)=1/6
a+1/a+1=6
a+1/a=5
(a+1/a)^2=25
a^2+1/a^2=23
a^2/(a^4+a^2+1)
=1/[a^2+1/a^2+1]
=1/(23+1)
=1/24你知道我的2是什么意思吗平方呗哦，你知道啊4呢4次方呗