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Sagot :

Pour la A= 5-3(2a+b) -5+(2a-5b)
= 5-6a-3b-10a+25b
=5-16a+22b

= 5-3(2a+b) -5+(2a-5b)= 5-6a-3b-10a+25b=5-16a+22b

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