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Sagot :

Réponse:

Exercice 1 :

1 si x = -2

A= 3*-2*-2+7*6-(-2)*6 = 66

2 A= 3x^2+7y-xy

Exercice 2

A= -3x^2-4

B= -3x+6-4y

Exercice 3

A= x(3+4)= 7x

B= x(8x-3)

C= y^2(25x+5)

D= x^2y(42-7)

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