Sagot :

Bonjour,

(4/7)⁴ = 4⁴/7⁴ = 256/2401

(4/7)⁻⁴ = 1/(4/7)⁴ = 1/(256/2401) = 2401/256

(10/3)² = 10²/3² = 100/9

(10/3)⁻² = 1/(10/3)² = 1/(100/9) = 9/100