Réponses

Meilleure réponse !
  • Utilisateur Brainly
2013-10-30T13:34:53+01:00
A=2(√11-3)/(√11+3)
   =2(√11-3)²/((√11+3)(√11-3))
   =(2(11+9-6√11))/(11-9)
   =20-6√11

B=5/(√3-2)-2/(√3+2)
  =5(√3+2)/((√3-2)(√3+2))-2(√3-2)/((√3+2)(√3-2))
  =(5√3+10)/(3-4)-(2√3-4)/(3-4)
  =-5√3-10+2√3-4
  =-3√3-14