Răspuns :
a+b+c=42
a+(a+2)+(a+4)=42
3a+6=42
3a=42-6
3a=36
a=36:3
a=12
b=12+2
b=14
c=12+4
c=16
proba:12+14+16=26+16=42
a+(a+2)+(a+4)=42
3a+6=42
3a=42-6
3a=36
a=36:3
a=12
b=12+2
b=14
c=12+4
c=16
proba:12+14+16=26+16=42