Răspuns :
a=primul număr
b=al doilea număr
a |-----|-----|-----|-----|-----|-----|+3
b |-----|
Suma=45
45-3=42
b=42:7
b=6
a=6×6+3
a=36+3
a=39
Verificare: 39+6=45
39:6=6 rest 3
b=al doilea număr
a |-----|-----|-----|-----|-----|-----|+3
b |-----|
Suma=45
45-3=42
b=42:7
b=6
a=6×6+3
a=36+3
a=39
Verificare: 39+6=45
39:6=6 rest 3
a+b=45
a:b=6 rest 3
a=6×b+3;inlocuim pe a in prima operatie
6b+3+b=45
7b=45-3
7b=42
b=42:7
b=6
a=6×6+3
a=36+3
a=39
V:39+6=45