Olá

A)

96, 72, 120 | 2

48, 36, 60 | 2

24, 18, 30 | 2

12, 9, 15 | 2

6, 9, 15 | 2

3, 9, 15 | 3

1, 3, 5 | 3

1, 1, 5 | 5

1, 1, 1 | 1

[tex]{\large\boxed{\boxed{  { \large \tt MMC = 2 . 2 . 2 . 2 . 2 . 3 . 3 . 5 = 1440}}}}[/tex]

B)

135, 105, 90 | 2

135, 105, 45 | 3

45, 35, 15 | 3

15, 35, 5 | 3

5, 35, 5 | 5

1, 7, 1 | 7

1, 1, 1 | 1

[tex]{\large\boxed{\boxed{  { \large \tt MMC = 2 . 3 . 3 . 3 . 5 . 7 = 1890 }}}}[/tex]

[tex]{\large\boxed{\boxed{  { \large \tt BONS \: \: ESTUDOS \: MEU \: ANJO \:<3 }}}}[/tex]