Bonjour je n'arrive pas faire ses exercices sur la double distribuvité :
Exercices 1 :

Q= ( 10+2x ) * ( 5x+2 )

P= ( b+15 ) * ( b-2 )

R= ( 3y-7 ) * ( 2-4y )

Exercices 2 :

( 5y+3 ) * ( 4y-8 ) = 20y2 - 28y + 24 testez l'égalité pour y= -2
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