Réponse :
EX4
1) A = 5⁸ x (5⁻²)³/5³ x 5⁻¹⁰ = 5⁸ x 5⁻⁶/5⁻⁷ = 5² x 5⁷ = 5⁹
2) B = 9⁵ x (3⁻⁴)²/3⁻⁷ x 3⁶ = (3 x 3)⁵ x 3⁻⁸/3⁻¹ = 3¹⁰ x 3⁻⁸/3⁻¹ = 3¹⁰ x 3⁻⁷ = 3³
3) C = 16³ x 5⁷ = (8 x 2)³ x 5⁷ = 8³ x 2³ x 5⁷ = (2³)³ x 2³ x 5⁷ = 2⁹ x 2³ x 5⁷
= 2¹² x 5⁷ = 2⁷ x 5⁷ x 2⁵ = 2⁵ x (2 x 5)⁷ = 32 x 10⁷ = 3.2 x 10⁸
Explications étape par étape
