quelqu’un peux m’aider à faire ces exo de math svp ?(au mois un des trois)

Bonjour,

C = (1/5 - 1/3) : 7/11

C = [(1 x 3) / (5 x 3) - (1 x 5) / (3 x 5)] : 7/11

C = (3/15 - 5/15) : 7/11

C = - 2/15 : 7/11

C = - 2/15 x 11/7

C = - 22/105

D = 11/3 - 7

       25/6

D = (11/3 - (7 x 3) / (1 x 3)

              25/6

D = (11/3 - 21/3)

           25/6

D = - 10/3 : 25/6

D = - 10/3 x 5/26

D = - 50/78

D = (2 x - 25) / (2 x 39)

D = - 25/39

E = (2/3 - 5/6) : (7 - 5 x 1/5)

E = [(2 x 2) / (3 x 2) - 5/6] : [(7 x 5) / (1 x 5) - 5/5]

E = (4/6 - 5/6) : (35/5 - 5/5)

E = - 1/6 : 30/5

E = - 1/6 x 5/30

E = - 5/180

E = (5 x - 1) / (5 x 36)

E = - 1/36.