Bonjour je n'arrive pas cet exercice svp Exercice :
Développer et réduire.
B = 4a - 2b(7-4a) - 5 + 3a(4b- 1)
C = 3(7 - 4a) + 5b(4a - 2) - 8a(3 - 4b)
D= 5- (7a - 2b) + 2b(3a - 4) - a(b - 1) ​
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