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Exercice 1 :  Dévellopper et reduire ses expressions :
A= 10(2y+3)+5(7y-4) B=9a(6a-4)-(8a+7-5a²) C= 3z (6z-5)-7z(8z-12) D= -4t(11t-2)-9t(2t²-5)                       Aider moi silvouplait!   Merci d'avance .. !

Sagot :

A=10(2y+3)+5(7y-4)
A=20y+30+35y-20
A=55y+10

B=9a(6a-4)-(8a+7-5a²)
B=54a²-36a-8a-7+5a²
B=59a²-44a-7

C=3z(6z-5)-7z(8z-12)
C=18z²-15z-56z²+84z
C=-38z²+69z

D=-4t(11t-2)-9t(2t²-5)
D=-44t²+8t-18t³+45t
D=-18t³-44t²+53t

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