bonjour pouvez-vous m’aider pour résoudre les 2 fraction de l’exercice 1 merci

Bonjour

A = 5/4 - 11/4 : 36/9

A = 5/4 - 11/4 x 9/36

A = 5/4 - 11/4 x 9/(9 x 4)

A = 5/4 - 11/4 x 1/4

A = (5 x 4)/(4 x 4) - 11/16

A = 20/16 - 11/16

A = 9/16

B = 7 - (3 + 1/4) x 2/3 + 3/4

B = 7 - [(3 x 4)/4 + 1/4] x 2/3 + 3/4

B = 7 - (12/4 + 1/4) x 2/3 + 3/4

B = 7 - 13/4 x 2/3 + 3/4

B = 7 - (13 x 2)/(4 x 3) + 3/4

B = (7 x 4)/4 - 13/6 + 3/4

B = 28/4 + 3/4 - 13/6

B = 31/4 - 13/6

B = (31 x 3)/(4 x 3) - (13 x 2)/(6 x 2)

B = 93/12 - 26/12

B = 67/12