Răspuns :
pentru a compara mai usor putem scrie:
3,92(1)=3,921111
3,(921)=3,921921
3,9(21)=3,92121⇒3,921< 3,921111<3,92121<3,921921⇒3,921<3,92(1)<3,9(21)<3,(921)
3,921=3,921
3,92(1)=3,921111
3,(921)=3,921921
3,9(21)=3,92121⇒3,921< 3,921111<3,92121<3,921921⇒3,921<3,92(1)<3,9(21)<3,(921)
3,921=3,921