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Sagot :

Bonjour,

(1-8y)(8y+1)

= 8y +1 -64y -8y

= -64y +1

(3x+9)(-4x-1)

=  -12x² -3x -36x -9

=  -12x²

= -12x²  -39x -9

(3x+9)(-4x-1)

=  C'est le même

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