n=9a+8
n=3b+2
9a+8=3b+2
3b-9a=8-2
3(b-3a)=6
b-3a=2
aleg a=1 b=2+3=5
9x1+8=17
17:6= 2 si rest 5
17:3= 5 si rest 2
deci numarul este 17
12=2²x3
28=2²x7
36=2²x3²
cmmmc=2²x3²x7=4*9*7=252
900<M252<1600
252*4=1008
252*5=1260
252*6=1512
nr sunt
1008+7=1015
1260+7=1267
1512+7=1518