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Valentinetrp72
@Valentinetrp72
April 2019
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Bonjour je n'arrive pas a mon exo de maths pouvez vous m'aider sil vous plait !
exercice 1 :
C=(√5+√10)² - 10√2
montrer que C est un nombre entier.
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C=(√5+√10)² - 10√2
C=(√5)²+2*(√5)*(√10)+(√10)²-10√2
C=5+2√(5*10)+10-10√2
C=5+2√50+10-10√2
C=5+2√(25*2)+10-10√2
C=5+2*5√2+10-10√2
C=5+10√2+10-10√2
C=15
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C=(√5)²+2*(√5)*(√10)+(√10)²-10√2
C=5+2√(5*10)+10-10√2
C=5+2√50+10-10√2
C=5+2√(25*2)+10-10√2
C=5+2*5√2+10-10√2
C=5+10√2+10-10√2
C=15