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Sagot :

Bonjour,

A=(4x+5)(3x+2)

= 12x² +8x +15x +10

= 12x² +23x +10

B=(5x-2)(x+7)

=  5x² +35x -2x -14

= 5x² +33x -14

C=(4x-3)(5x-2)

= 20x² -8x -15x +6

= 20x² -23x +6

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