Question

Determinati toate nr naturale de 2 cifre care impartite printr-un nr de o cifra dau restul 7
E urgeeent!!!

Answer 1

10≤8×n+7≤99 
 numerele ={15,23,31,39,47,55,63,71,79,87,95}
10≤9×n+7≤99 
 numerele ={16,25,34,43,52,61,70,79,88,97}