a) 12=2²•3
28=2²•7
30=2•3•5
c.m.m.m.c= 2²•3•5•7 =420
b) 15=3•5
35=5•7
42=2•3•7
c.m.m.m.c=2•3•5•7=210
e)16=2⁴
20=2²•5
36=2²•3²
c.m.m.m.c=2⁴•3²•5=720
c)25=5²
40=2³•5
45=3²•5
c.m.m.m.c=2³•3²•5²=1800
f)54=2•3³
60=2²•3•5
72=2³•3²
c.m.m.m.c.=2³•3³•5=1080
d)18=2•3²
24=2³•3
28=2²•7
c.m.m.m.c=2³•3²•7=504
sper ca nu am gresit nici un calcul. coroana?
