х^2+1/х^2=(х+1/х)^2-2
(х+1/х)=t
t^2-4t+3=0
t=1 t=3
x+1/x-1=0 x+1/x-3=0
нет корней x^2-3x+1=0
x1*x2=1
х^2+1/х^2=(х+1/х)^2-2
(х+1/х)=t
t^2-4t+3=0
t=1 t=3
x+1/x-1=0 x+1/x-3=0
нет корней x^2-3x+1=0
x1*x2=1