Răspunsuri

2014-11-08T19:51:38+02:00
N = 8·5 + r       r < 8      r∈{0,1,2,3,4,5,6,7} ⇒ n∈{40,41,42,43,44,45,46,47}
S =40 + 41 + .........+47 =[ (40+47) +(41+46)+...} =87·4 =348
2014-11-08T19:52:12+02:00