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Sagot :

Bonjour,

A=

4x² +12x -7x -56

= 4x² +5x -56

B=

-2x² -4x +3x +6

= -2x² -x +6

C=

-10x² -5x +4x +2

= -10x² -x +2

D=

9x² -30x +25

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