Răspuns :
(83-8)/90+1/3-4/6=
1/2+1/6 aducând la același numitor 4/6=2/3
75/90+1/3-2/3=
(75+30-60)/90=
45/90=
1/2
1/2+1/6 aducând la același numitor 4/6=2/3
75/90+1/3-2/3=
(75+30-60)/90=
45/90=
1/2