Réponse:
A=x² -25
=x²-5²
=(x-5)(x+5)
B=9x²-16
=(3x)²-4²
=(3x-4)(3x+4)
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Réponse:
A=x² -25
=x²-5²
=(x-5)(x+5)
B=9x²-16
=(3x)²-4²
=(3x-4)(3x+4)