Question

Afla toate numerele naturalede forma abc ,in care 4a+b+c=12

Answer 1

abc :  4a+b+c=12, a≠0
daca a=1, b+c=12-4 =>b+c=8
417,426,435,453,462,471,408, 480;

daca a=2 , b+c=12-8 =>b+c=4
804, 813,831,840.

daca a=3 , b+c=12-12 =>b+c=0
Nu exista doua numere naturale nenule a caror suma sa fie 0.