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Sagot :

Pour exercice 4:
A=a(a+2)
=a exposant 2 +2a

B=b(5-7b)
=5b-7b exposant 2

C=2x(x-3)
=2x exposant 2 -6x

D=-3y(1+2y)
=-3y-6y exposant 2

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