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vivafifa1591
@vivafifa1591
January 2021
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dans chaque cas justifier que les nombres A et B sont égaux
A) 3 racine carrée de 80 et B 4 racine carrée de 45
B) 7 racine carrée de 108 et B 6 racine carrée de 147 c URGENT MERCI D AVANCE
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MAHAM
BONSOIR
A) 3√80=3√16×5
=4×3√5
=12√5
B) 4√
45
4√9×5
3×4√5
12√5
donc A=B
B) 7√108 =7√9×12
=3×7√12
=21√12
=21√4×3
=2×21√3
=42√3
6
√147
6√49×3
7×6√3√
42√3
donc A=B
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vivafifa1591
merci beaucoup :)
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A) 3√80=3√16×5
=4×3√5
=12√5
B) 4√ 45
4√9×5
3×4√5
12√5
donc A=B
B) 7√108 =7√9×12
=3×7√12
=21√12
=21√4×3
=2×21√3
=42√3
6 √147
6√49×3
7×6√3√
42√3
donc A=B