Question

Cate numerr naturalefe forma abc bara deasupra si au produsul stiid ca a+c=6·b

Answer 1

a+c=multiplu de 6;
a-numar de o cifra;
c-numar de o cifra;
⇒a=1,2,3,4,5,6,7,8,9;
⇒c=1,2,3,4,5,6,7,8,9;
⇒b=1,2,3;
⇒numerele naturale de forma abc bara deasupra sunt
151 ,511 ,241 ,421 ,331 ,601 ,752 ,572 ,662 ,842 ,482 ,392 ,932 ,993;
⇒14 numere;