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Sagot :

Réponse:

1)4x(7x-2) _ 3(7×-2)

28x²-8x - 21x -6

=28x²-29x-6

2) mettez 2x+1 en facteur

2)(2x+1) [(3-x)-(2+5x)]

[2x+1] ( 6-15x-2x+5x²)

=[2x+1] ( 6-17x +5x²)

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