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Meilleure réponse !
2014-10-17T17:50:08+02:00
Bonjour

A = y - x
A = 5 - (-3) = 5 +3 = 8

B = yx - x
B = -15 +3 = -12

C = x( 2 y - 5 x) 
C = -3 ( 10  + 15) = - 3 x 25 = - 75

D = 6 + 12 : 6 - 15 = 18 : - 9 = -2