Réponse :

A = (3/2 - 1/3) / (3/4 + 2/3)

= (9/6 - 2/6) / (9/12 + 8/12)

= (7/6) / (17/12)

= 7/6 X 12/17 = 14/17

________

B = 2 + (2/7) / (5/14)

= 2 + (2/7) X 14/5

= 2 + 4/5

= 10/5 + 4/5

= 14/5

________

C = -(3/14) - 3/(7/5) + 2

= -(3/14) - 15/7 + 2

= -3/14 - 30/14 + 28/14

= -3/14 - 2/14

= -5/14

________

D = 7/5 + (8/15)/(2/3) - 19/2

= 7/5 + (8/15 X 3/2) - 19/2

= 7/5 + 4/5 - 19/2

= 11/5 - 19/2

= 22/10 - 95/10

= -73/10

_________

E = (3 - 7/5) / (1 - 9/10)

= (15/5 - 7/5) / (10/10 - 9/10)

= (8/5) / (1/10)

= 8/5 X 10

= 8 X 2 = 16

_________

F = -(7/8) + (5/6)/4 - 1

= -(7/8) + (5/6 X 4) - 1

= -(7/8) + (10/3) - 1

= -21/24 - 24/24 + 80/24

= -45/24 + 80/24

= 35/24