Bonsoir,

A = 3/16 + 1/4

A = 3/16 + (1 x 4) / (4 x 4)

A = 3/16 + 4/16

A = 7/16

B = 6/5 + 7/10

B = (6 x 2) / (5 x 2) + 7/10

B = 12/10 + 7/10

B = 19/10

C = 1/5 + 3/4

C = (1 x 4) / (3 x 4) + (3 x 5) / (4 x 5)

C = 4/12 + 15/12

C = 19/12

D = 18/7 - 2/21

D = (18 x 3) / (7 x 3) - 2/21

D = 54/21 - 2/21

D = 52/21

E = 19/4 - 5/28

E = (19 x 7) / (4 x 7) - 5/28

E = 133/28 - 5/28

E = 128/28

E = (4 x 32) / (4 x 7)

E = 32/7.

F = 1/2 - 1/3

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

F = 3/6 - 2/6

F = 1/6.