Question

mmc 20,50,120 ??????

Answer 1

20, 50, 120 | 2
10, 25, 60   | 2
5,   25, 30   | 2
5,   25, 15   | 3
5,   25,  5    | 5
1,   5,    1    | 5
1,   1,    1    | = 2³ * 3 * 5² = 600

Answer 2

Podemos fatorar:
20,50,120 | 2
  10,25,60 | 2
    5,25,30 | 2
    5,25,15 | 3
      5,25,5 | 5
        1,5,1 | 5
        1,1,1 |

MMC (20,50,120):{2.2.2.3.5.5}
MMC (20,50,120):{2³.3.5²}
MMC (20,50,120):{8.3.25}
MMC (20,50,120):{600}