Réponses

2014-01-18T18:30:44+01:00
Bonsoir

C = (4 + √ 5 )(4- √ 5)
C = 16 - 5 = 11

 
D = 2 √  45+ √  81 -3 √  20 +2

D = 2√5x3² + √9² - 3√5 x 2² +2
D = 6√5 + 9 - 6√5 +2
D = 11