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Sagot :

Réponse:

A=4 × x - 4 × y

= 4 (x-y)

B= 7×7×a - 7×b

=7 (7a-b)

C=3×x×x + 7×x

=x (3x + 7)

D=x×y - x×1

=x (y - 1)

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