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Sagot :

Bonjour,

Développer:

A= (5a+3) (4a+7)= 20a²+12a+35a+21= 20a²+47a+21

B=(6a-4) (7a-3)= 42a²-28a-18a+12= 42a²-46a+12

C=( - 4a+3) (4a-4)= -16a²+12a+16a-12= -16a²+28a-12

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