Bonjour,
• 2-¹ = 1/2
• 2-² = 1/2 × 1/2 = 1/4
• 3-³ = 1/3 × 1/3 × 1/3 = 1/27
• 5-⁴ = 1/5 × 1/5 × 1/5 × 1/5 = 1/625
• (2/5)² = 2/5 × 2/5 = 4/25
• (1/4)³ = 1/4 × 1/4 × 1/4 = 1/64
• (1/5)-² = 1/(1/5) × 1/(1/5) = 5 × 5 = 25
• (5/3)-³ = 1/(5/3) × 1/(5/3) = 3/5 × 3/5 = 9/25