Réponses

  • Utilisateur Brainly
2013-04-23T15:42:54+02:00

(5-√5) (3+2√5) (2-√5) - (1-2√5)

=(15+10√5-3√5-2*5)(2-√5)-(1-2√5)

=(5+7√5)(2-√5)-1+2√5

=10-5√5+14√5-7*5-1+2√5

=-25+9√5-1+2√5

=-26+11√5