Răspuns :
a+b=?
a-b=15
(a+b):a-b=3r2
b=15-2=13
a=13x2+2=28
verificare
13+28=41
41:13=3r2
a-b=15
(a+b):a-b=3r2
b=15-2=13
a=13x2+2=28
verificare
13+28=41
41:13=3r2