63,5
Объяснение:
x+1/(2x)=3
(x+1/(2x))^2=x^2+1/(4x^2)+2*x*1/(2x)=x^2+1/(4x^2)+1=9
x^2+1/(4x^2)=8
(x^2+1/(4x^2))^2=x^4+1/(16x^4)+2*x^2*(1/(4x^2))=
x^4+1/(16x^4)+1/2=64
x^4+1/(16x^4)=63,5
