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Sagot :

Bonjour,

1)

A= -12x -21

B= -18x² -6x

2)

2*(-2)²  +  3(-2)  = 2

8 -6 = 2

Vrai

3)

8x-5x = 11 +4

3x = 15

x= 15/3

x=5

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