Resposta:
mdc (12; 36; 48) = 12
12; 36; 48 / 2
6; 18; 24 / 2
3; 9, 12 / 3
1; 3; 4 -> mdc = 2 . 2 . 3 = 12
mdc (33; 11; 55) = 11
33; 11; 55 / 11
3; 1; 5 -> mdc = 11
mdc (15; 35; 20) = 5
15; 35; 20 / 5
3; 7; 4 -> mdc = 5
mdc (30; 60; 180) = 30
30; 60; 180 / 30
1; 2; 6 -> mdc = 30
Espero ter ajudado.
