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Sagot :

Bonjour,

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

= -4x² +6x +10x -15

=  -4x² +16x -15

B = (-3x + 4)(-5x4)

= 15x² -12x -20x +16

=  15x² -32x +16

C = (2x-5)(-4x -8)

= -8x²-16x +20x +40

= -8x² +4x +40

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