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Flavievillayes
@Flavievillayes
May 2019
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Bonjour pouvez -vous m'aider pour un autre exo de mon DM de maths niv 3ème : merci d'avance !
1) Ecrire chacun des nombres suivants sous la forme a√b ou a et b sont des nombres entiers , b étant le plus petit possible:
A= √150 ; B= √72 ; C= √98
2) D = 2√50 + 6√72 - 3√98 ⇒ Simplifier D.
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Commentaires (10)
Bonsoir ,
A = √25 × √6
A = 5√6
B = √9 × √8
B = 3√8
B = 3 × √4 × √2
B = 3 × 2 × √2
B = 6√2
C = √49 × √2
C = 7√2
2.
D = 2 × √25 × √2 + 6 × √9 × √8 - 3 × √49 × √2
D = 2 × 5 × √2 + 6 × 3 × √4 × √2 - 3 × 7 × √2
D = 10√2 + 36√2 - 21√2
D = (10+36-21) √2
D = 25√2
3 votes
Thanks 2
flavievillayes
en tout cas merci de m'avoir répondu aux deux exo de maths c'est très gentil de votre pars ;)
flavievillayes
par contre dans la question 1 le B il faut que b doit etre le plus petit possible es que c'est le plus petit possible 8 ?
flavievillayes
donc la réponse ne change pas ?
flavievillayes
ok merci !
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A = √25 × √6
A = 5√6
B = √9 × √8
B = 3√8
B = 3 × √4 × √2
B = 3 × 2 × √2
B = 6√2
C = √49 × √2
C = 7√2
2.
D = 2 × √25 × √2 + 6 × √9 × √8 - 3 × √49 × √2
D = 2 × 5 × √2 + 6 × 3 × √4 × √2 - 3 × 7 × √2
D = 10√2 + 36√2 - 21√2
D = (10+36-21) √2
D = 25√2