Resposta :

18, 24, 36, 72 | 2
  9, 12, 18, 36 | 2
  9,   6,   9, 18  | 2
  9,   3,   9,   9  | 3
  3,   1,   3,   3  | 3
  1,   1,   1,   1 |

Mmc(
18, 24, 36, 72) = 2 x 2 x 2 x 3 x 3 x 3 = 72
18,24,36,72/2
9,12,18,36/2
9,6,9,18/2
9,3,9,9/3
3,1,3,3/3
1,1,1,1            2x2x2x3x3= 72

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