Bonjour,
Voilà la réponse
A = 5 / 4 - 3 / 16
A = 20/16-3/16
A = 17/16
B = 9/ 10 + - 5 /2
B = 9/10 + -25/10
B = -16/10
B = -8/5
C = 1- 17/15
C = 1/1-17/15
C = 15/15-17/15
C = -2/15
D = 3+ - 7/5 - 17/20
D = 3/1+ -7/5 - 17/20
D = 15/5 + -7/5 - 17/20
D = 8/5 - 17/20
D = 32/20-17/20
D = 15/20
D = 3/4