(1/x)+x=3,则x²/(x⁴+x²+1)=?
问题描述:
(1/x)+x=3,则x²/(x⁴+x²+1)=?
答
x²/(x⁴+x²+1)
=1/(x^2+1+1/x^2)
=1/[(x+1/x)^2-1]
=1/8