notam n numarul de elevi
n<220
n:8=a rest 4
n:9=b rest 5
n:12=c rest 8
5/n
n=8×a+4 ]+4
n=9×b+5
n=12×c+8
n+4=8a+8
n+4=9b+9
n+4=12c+12 n€M[8,9,12]
n+4={72,144,226,......
n<220》.......n+4=144.....n=140
5/n.
in rezolvarea exercitiului ai sa observi ca tinem cont de proprietatile divizibilitatii, c.m.m.m.c....
