• -3/4 et 5/12 :

(-3 × 3) / (4 × 3) =

• 6/15 et 4/3 :

(4 × 5) / (3 × 5) =

• -7/4 et 5/3 :

(-7 × 3) / (4 × 3) = et (5 × 4) / (3 × 4) =

• 13/(-9) et 11/6 :

(13 × 6) / (-9 × 6) = et (11 × (-9)) / (6 × (-9)) =

• -8/7 et -4/3 :

(-8 × 3) / ( 7 × 3) = et (-4 × 7) / (3 × 7) =