Salut alors...
A = 3/4 - 5/6 +7/3
A = -1/12 + 7/3
A= 9/4
B = 4/5 - (7/10 - 5/6)
B = 4/5 - (-2)/15
B = 14/15
C= 2 + 2/3 * 1/4
C = 2 + 1/6
C = 13/6
D= 3/4 - 5/4 * 2
D= 3/4 - 5/2
D= -7/4
E= 8/10 + 15/12 * 14/35
E = 8/10 + 1/2
E= 13/10
F= (8/10+ 15/12) * 14/35
F= 41/20 * 14/35
F= 41/50
J'espère t'avoir aidé...