Răspuns :
a+b+c=26
b=a+2
c=b+4=a+2+4
a+a+2+a+2+4=26
3a+8=26
3a=26-8
3a=18
a=18:3
a=6
b=a+2=6+2=8
c=b+4=8+4=12
6+8+12=26(verificare)
b=a+2
c=b+4=a+2+4
a+a+2+a+2+4=26
3a+8=26
3a=26-8
3a=18
a=18:3
a=6
b=a+2=6+2=8
c=b+4=8+4=12
6+8+12=26(verificare)