Răspuns :
(a+b):2=15
a=9
a+b=15*2
9+b=30
b=30-9
b=21
Deci a=9,b=21
proba: (9+21):2=30:2=15
a=9
a+b=15*2
9+b=30
b=30-9
b=21
Deci a=9,b=21
proba: (9+21):2=30:2=15
Notez cu a,b numerele
(a+b) :2=15
a=9
(a+b):2=15 => a+b=2*15
a+b=30
dar a=9
9+b=30
b=30-9
b=21
Numerele sunt : a=9
b=21
(a+b) :2=15
a=9
(a+b):2=15 => a+b=2*15
a+b=30
dar a=9
9+b=30
b=30-9
b=21
Numerele sunt : a=9
b=21