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Sagot :

Réponse:

C=x(x-5)+(-5+x)(7x-3)

C=(x-5)(x+7x-3)

C=(x-5)(8x-3)

D=(6-x)(8x-4)-(6-x)(3+5x)

D=(6-x) (8x+4-(3+5x))

D=(6-x) (8x+4-3-5x)

D=(6-x) (3x+1)

Voilà

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