Réponse :
Explications étape par étape
A= 3a + 5 -2a - 7 + 8 -5a
= 3a - 2a -5a + 8 - 7 +5
= 4a + 1 + 5
= 4a +6
B = -b +4 + 3b -2 - 8b +5
= -9b + 9 -2 +3b
= -6b +7
C = 6 -5c +3c -4+6c+5+7-2c
= -5c+6c-2c+3c+6-4+5+7
= -1c + 3c + 2 +12
= 4c + 14
D= d - 1 -3d -4 +5 -4d - 7d-5+5
= 3d +d +5-5-5+5-7d-4d
= 4d-11d
