Question

quais são os divisores de 40 que também são divisores de 60

Answer 1

D 40 { 1,2,4,5,8,10,20,40}

D 60 {1,2,3,4,5,6,10,12,15,20,30,60}

Os divisores de 40 que também são divisores de 60 são:
1,2,4,5,10 e 20

Answer 2

   Fatorando:

                                 1                                                1
                     40 | 2 | 2                                     60 | 2 | 2
                     20 | 2 | 4                                     30 | 2 | 4
                     10 | 2 | 8                                     15 | 3 | 3,6,12
                       5 | 5 | 5,10,20,40                        5 | 5 | 5,10,20,15,30,60
                       1                                                 1
  
     D(40) = {1,2,4,5,8,10,20,40}
     D(60) = {1,2,3,4,5,6,10,12,15,20,30,60}

    D(40,60) = {1,2,4,5,10,20}