Réponses

  • Utilisateur Brainly
2012-04-29T23:01:53+02:00

A=8+12√5-(9+12√5+20)=8-9-20+12√5-12√5=-21

2012-04-29T23:13:46+02:00

A=8+12√5-(9+12√5+20)

A=8-9-20+12√5-12√5

A=-21