Bonsoir calculer : (-5)^-4X(-5)^3 et (-5)^-4/(-5)^3
Mathématiques
schelbyyomi
Question
Bonsoir
calculer : (-5)^-4X(-5)^3 et (-5)^-4/(-5)^3
calculer : (-5)^-4X(-5)^3 et (-5)^-4/(-5)^3
2 Réponse
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1. Réponse Anonyme
Bonsoir,
calculer : (-5)^-4X(-5)^3 et (-5)^-4/(-5)^3
[tex](-5)^{-4}\times(-5)^3= (-5)^{-4+3}=(-5)^{-1}=\dfrac{1}{-5}=-\dfrac{1}{5}\\\\\dfrac{(-5)^{-4}}{(-5)^3}= (-5)^{-4-3}= (-5)^{-7}=\dfrac{1}{(-5)^7}=\dfrac{1}{[(-1)\times5]^7}=\dfrac{1}{(-1)^7\times5^7}\\\\=\dfrac{1}{(-1)\times5^7}=\dfrac{1}{-5^7}=-\dfrac{1}{78125} [/tex] -
2. Réponse caro67000
1) (-5)^-4X(-5)^3 =
(-5) ^(-4+3) =
(-5)^-1 =
- 1/5
= - 0.2
2) (-5)^-4/(-5)^3 =
(-5) ^-4 x ( -5) ^-3 =
(-5) ^-7 =
1/(-5)^7=
- 0, 0000128