Resposta:
3)UM-C-D-U
a- 3-4-7
b- 6-9-4
c- 1 - 0-4-1
4)UM C D U
a 6 4 3
b 1 2 8 6
c 1 9 2 9
5)UM C D U
a 5 4 8
b 1 6 4 4
c 1 0 9 6
