Réponse :

Bonsoir

Explications étape par étape

Exercice 3

A = -5s -10s -4 +4 -3s² - (-7)s²

A = -15s -3s² +7s²

A = -15s +4s²

B = 6w -1 -8w² +3w² +3w -4

B = 9w -5 -5w²

C = -6v - (-9) -4v² -4 -5v² -v

C = -6v +9 -4v² -4 -5v² -v

C = -9v² -7v +5

D = 7 X (-y) X (-6) X 9y - (-9)y²

D = -7y X -6

D = +42y X 9y

D = 378 y² +9y²

D = 387y

E = -6 X (-2) X t +9t² -9t

E = +12t +9t² -9t

E = 9t² +3t

F = -3y X (-5) X -y X -2 -30y²

F = +15y X -y

F = -15y² X -2 -30y²

F = +30y² -30y² = 0