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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