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Sagot :

Réponse :

a. 3x - 9 + 12

= 3x + 3

b. xy - xy + x

= x

c. 36 - 4x^2 - (2x^2 - 8x + x - 4)

=36 - 4x^2 - 2x^2 + 8x - x + 4

= 40 - 6x^2 + 7x

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