Bonjour à tous voici mon exercice.

simplifier au maximum en supprimant le signe x lorsque cela est possible :
A= -3*x*(-5*x)+2*x*(-7y)
B= 2*t*t*t+5t*(-4t)
C= (2*4*a+5)*(3-7*a)
D= -5*x+2*(-4)*(3*x-2)

Merci d'avance pour vos réponses
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