Réponse:
5×(3g+1)(g-2)
5×3g+5×1(g-2)
15g+5×g-2
15g+5g-2
20g-2
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Réponse:
5×(3g+1)(g-2)
5×3g+5×1(g-2)
15g+5×g-2
15g+5g-2
20g-2