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Sagot :

Salut

1) (2x+1)(1-3x)-2(2x+1)

= 2x-6x²+1-3x-4x-2

= -6x²-5x-1

2) (2x+1)(1-3x)-2(2x+1)

=  (2x+1)(1-3x-2)

=  (2x+1)(-3x-1)

= -(2x+1)(3x+1)

3) A(-1) = -(2(-1)+1)(3(-1)+1) = -2

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