Răspunsuri

2014-11-12T19:42:02+02:00
M7 apartine { 1x7, 2x7, 3x7, 4x7,    , nx7 / n apartine N* }, adica
M7 apartine { 7, 14, 21, 28, ....}
2014-11-12T20:01:45+02:00