Pouvez-vous m’aidez à faire cette exercice merci

Bonjour,

A = 1/5 × -4/3 + 7/2
A = -4/15 + 7/2
A = -8/30 + 104/30
A = 97/30

D = 7/3 + 3/2 × -10/21
D = 7/3 + -30/42
D = 98/42 + -30/42
D = 68/42
D = 34/21 

B = 4/5 ÷ (- 3/7) - 7/10
B = 4/5 ÷ (- 30/70 - 49/70)
B = 4/5 × (- 70/79)
B = - 280/395
B = - 56/79

E = 5/8 + (- 3/4) ÷ ( - 9/16)
E = 5/8 + (- 3//4 × - 16/9)
E = 5/8 + (48/36)
E = 5/8 + 4/3
E = 15/24 + 32/24
E = 47/24

C = 13/7 + (- 8/7) ÷ (- 4/5)
C = 13/7 + (- 8/7) × (- 5/4)
C = 13/7 + 40/28
C = 13/7 + 10/7
C = 23/7

F = 6/5 - (- 1/9) × (- 3/4)
F = 6/5 - (3/36)
F = 6/5 - 1/12
F = 72/60 - 5/60
F = 67/60