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Meilleure réponse !
  • Utilisateur Brainly
2014-03-25T18:25:04+01:00
K=3√5+2√10 ET L=3√5-2√10

A = K+L = (3V5+2)+(3V5-2V10) = 6V5-2V10+2

B= K - L =
(3V5+2)-(3V5-2V10) = 2V10+2

C= K x L =
(3V5+2)(3V5-2V10) = 45-6V50+6V5-4V10 = 45+12V5+6V5-4V10 = 18V5-4V10+45

D= K² =(3V5+2)² = 45+12V5+4 = 12V5+49

E= L² = (3V5-2V10)² = 45-12V50+40 = 60V2+85