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Meilleure réponse !
2014-09-07T15:30:13+02:00
Bonjour

A = 3/7 + 1/4 - 2
A = 12/28 + 7/28 - 56/28
A = (12 + 7 - 56) / 28
A = -37/28

B = 6/7 x 5/9 x (-4)
B = 30/63 x (-4)
B = -120/63
B = -40/21

C = 15/7 : 5/4
C = 15/7 x 4/5
C = 60/35
C = 12/7

D = 5/11 - 4/11 x 5/2
D = 5/11 - (4/11 x 5/2)
D = 5/11 - 20/22
D = 10/22 - 20/22
D = -10/22
D = -5/11