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Sagot :

MARIEJOE57

Réponse :

bonjour!

Explications étape par étape :

A = 5 (4y - 3)

=5*4y -5*3

=20y-15

B=-8 (5-2y)

=8*5 -8*2y

=40-16y

C=4 (9y-7)+y (5y + 4)

=4*9y-4*7 +y*5y+*y*4

=36y-28 +5y²+4y

=5y²+40y-28

D= (5y + 4) (3y - 2)

=5y*3y -5y*2 +4*3y -4*2

=15y²-10y+12y-8

=15y²+2y-8

(*= multiplié par)

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