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Sagot :

Réponse:

-

Explications étape par étape:

(x-3) 2=( x-3)(×-3)=×2_3×_3×+9=×2-6×+9

(×-3)(1-2×)=×+6×2-3-6×=_2×2+7×-3

A=(×2_6×+9)+(_2×2+7×-3)

=×2-6×+9-2×2+7×-3

= -×2+×+6

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