Question

gasiti cifrele x si y astfel incat numarul 21x7y sa fie divizibil cu 3 si 5

Answer 1

y=0 sau 5
x=2, 5 sau 8

Answer 2

21x7y divizibil cu 5 

•21175,
•21275,•
21375,
•21475,
•21575,
•21675,
•21775,
•21785,
•21795,
•21075,
•21170,
•21270,
•221370,
•21470,
•21570,
•21670,
•21770,
•21870,
•21970,
•21070.

21x7y divizibile cu 3

•21172,
•21271,
•21372,
•21273,
•21474,
•21570,
•21075,
•21276,
•21672,
•21177
,•21771,
•21378,
•21873.