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Resposta:

Explicação passo a passo:

40, 60 | 2

20, 30 | 2

10, 15 | 2

 5, 15 | 3

 5,   5 | 5

 1,   1             mmc(40,60)=2³x3x5=120

45, 120 | 2

45,   60 | 2

45,   30 | 2

45,   15 | 3

15,     5 | 3

 5,     5,| 5      

 1,      1             mmc(45,120) = 2³ x 3² x 5 = 360

72, 45, 54 | 2

36, 45, 27 | 2

18, 45, 27 | 2

 9, 45, 27 | 3

 3, 15,   9 | 3

 1,   5,   3 | 3

 1,   5,   1 | 5

  1,   1,   1            mmc(72,45,54) = 2³ x 3³ x 5 =  1.080

15, 20, 25 | 2

15, 10, 25 | 2

15,   5, 25 | 3

 5,   5, 25 | 5

 1,   1,   5 | 5

  1,   1,   1             mmc(15,20,25) = 2² x 3 x 5² = 300