a)2;4;6
2=2
4=2²
6=2·3
_____
c.m.m.m.c.=2²·3=12
b)16;20;48
16=2⁴
20=2²·5
48=2⁴·3
_______
c.m.m.m.c.=2⁴·3·5=240
c)6;8;14
6=2·3
8=2³
14=2·7
______
c.m.m.m.c.=2³·3·7=168
d)28;49;35
28=2²·7
49=7²
35=5·7
______
c.m.m.m.c.=2²·5·7=140
e)25;70;100
25=5²
70=2·5·7
100=2²·5²
________
c.m.m.m.c.=2²·5²·7=700
f)72;54;36
72=2³·3²
54=2·3³
36=2²·3²
_______
c.m.m.m.c.=2³·3³=216
g)8;80;120
8=2³
80=2⁴·5
120=2³·3·5
_________
c.m.m.m.c.=2⁴·3·5=240
h)120;144;240
120=2³·3·5
144=2⁴·3²
240=2⁴·3·5
_________
c.m.m.m.c.=2⁴·3²·5=720