Exercitiul 2, va rog!

Salut!
[tex]100a+10b+c=10a+b+10b+c+10c+a=11a+11b+11c=>\\100a+10b+c=11a+11b+11c=>\\89a=b+10c=> a=1=>89=8*10+9=10c+b=>c=8,b=9=>\\abc=198[/tex]