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Sagot :

Réponse:

Bonsoir

Explications étape par étape:

(x-7)(2+y)= x×2+x×y -7×2-7×y

= 2x+xy-14-7y

= xy+2x-7y-14

(x-1)(1-x)= x×1+x×(-x) -1×1-1×(-x)

= x-x²-1+x

= -x²+x+x+1

= -x²+2x-1

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