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Sagot :

Bonjour,

(4x-5)² -(6x-3).

= 16x² -40x +25 -  6x +3

=16x² -46x +28

(5+x)(3x+2)+(-2x+4)(5x-1)

= 15x +10 +3x² +2x - 10x² +2x +20x -1

= -7x² +39x +9

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