Răspuns:
Explicație pas cu pas:
x+1/x=2
(x+1/x)³=x³+3x²·1/x+3x·1/x²+1/x³=x³+1/x³+3(x+1/x)
x³+1/x³=(x+1/x)³-3·2=2³-6=8-6=2