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Sagot :

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

D= (-2x+1)(-2x+1) - (3x+4)(3x+4)

D=(-2x+1-3x-4) (-2x+1+3x+4)

D=(-5x+3)(x+5)

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