SVP aider moi c urgent c un devoir maison en math

Bonjour

Ligne 1 :
* 2/3×1/4 = (2×1)/(3×4) = (2×1)/(3×2×2) = 1/(3×2) = 1/6
* 2/3×1/3 = 2/9
* 2/3×3 = 2
* 2/3×5/3 = 10/9
Ligne2 :
* 4/3×1/4 = 1/3
* 4/3×1/3 = 4/9
* 4/3×3 = 4
* 4/3×5/3 = 20/9
Ligne 3 :
* 4×1/4 = 1
* 4×1/3 = 4/3
* 4×3 = 12
* 4×5/3 = 20/3