Pouvez-vous aider s’il vous plaît j’ai du mal à faire ses fractions

bonsoir

Calculer :

A = 3/4 - 7/6

A = (3 x 3)/(4 x 3) - (7 x 2)/(6 x 2)

A = 9/12 - 14/12

A = -5/12

B = 3/4 x 8/33

B = 8/4 x 3/33

B = (4 x 2)/4 x 3/(3 x 11)

B = 2 x 1/11

B = 2/11

C = 2/7 x 3/2 - 8/7

C = 2/2 x 3/7 - 8/7

C = 3/7 - 8/7

C = -5/7

D = 4/3 + 2/3

D = (4 + 2)/3

D = 6/3

D = (3 x 2)/3

D = 2

E = (0,4 x 3,2)/3,6

E = (4 x 32)/360

E = (4 x 4 x 8)/(8 x 45)

E = 16/45

F = (20 - 8 x 7) / (8 - 7 x 20)

F = (20 - 56) / (8 - 140)

F = (-36)/(-132)

F = (3 x 12)/(11 x 12)

F = 3/11