Răspuns :
a+b=52
a:b= 3 rest 12
a= 3b+12
3b+12+b=52
4b= 52-12
4b= 40
b= 40:4
b= 10
a= 3×10+12
a= 30+12
a= 42
a:b= 3 rest 12
a= 3b+12
3b+12+b=52
4b= 52-12
4b= 40
b= 40:4
b= 10
a= 3×10+12
a= 30+12
a= 42