Bonjour,

C = 2/5 + 3/5 : (1 - 1/10)

C = 2/5 + 3/5 : [(1 x 10) / (1 x 10) - 1/10]

C = 2/5 + 3/5 : (10/10 - 1/10)

C = 2/5 + 3/5 : 9/10

C = 2/5 + 3/5 x 10/9

C = (2 x 9) / (5 x 9) + 30/45

C = 18/45 + 30/45

C = 48/45

C = (3 x 16) / (3 x 15)

C = 16/15

D = 7/3 - 4/3 : 2/5

D = 7/3 - 4/3 x 5/2

D = 7/3 - 20/6

D = (7 x 2) / (3 x 2) - 20/6

D = 14/6 - 20/6

D = - 6/6

D = - 1

E = 9 x 3/2 - 10

E = 27/2 - (10 x 2) / (1 x 2)

E = 27/2 - 20/2

E = 7/2

F = (3/2) x (3/2) - 1/3 x (- 5/2)

F = 6/4 + 5/6

F = (6 x 6) / (4 x 6) + (5 x 4) / (6 x 4)

F = 36/24 + 20/24

F = 56/24

F = (8 x 7) / (8 x 3)

F = 7/3.

G = - 4/3 + 11/12 : 22/18

G = - 4/3 + 11/12 x 18/22

G = - 4/3 + 198/264

G = - 4/3 + (66 x 3) / (66 x 4)

G = - 4/3 + 3/4

G = (- 4 x 4) / (3 x 4) + (3 x 3) / (4 x 3)

G = - 16/12 + 9/12

G = - 7 /12.