Răspuns :
(62+23)÷2=
85÷2=42.5
.............................
(62+23)÷2=
62÷2=31
23÷2=11.5
31+11.5=42.5
85÷2=42.5
.............................
(62+23)÷2=
62÷2=31
23÷2=11.5
31+11.5=42.5