Réponse :
Bonjour,
A= 3(2 – 4) + 5(3 – ) ? -> 3(2 – 4) + 5(-3 )? peut être
= 3 x (-2) + (-15)
= - 6 - 15
= - 21
B= 2(5 + 3) – 4( + 5)
= 2 x 8 - 4x5
= 16 - 20
= -4
C= (4 + 5)(3 + 2)
= 4x3 + 4x2 + 5 x3 + 5x2
= 12 + 8 + 15 + 10
= 45
D= (5 – 2)( + 7)
= 3 x 7
= 21