Réponse :

Explications étape par étape :

Bonjour

E = 3/4 × 12/15

E = (3×12)/(4×15)

E = (3×3×4) / (4×3×5)

E = 3/5

F = -10 / 7 × 21 / (-50)

F = (-10 × 21) / (7×(-50))

F = (-10 × 7×3) / ( 7 × (- 10)×5)

F = 3/5

G = 77/49 × 35/ - 121

G = - (77 × 35 ) / (49 × 121 )

G = - ( 7×11×5×7) /(7×11×7×11)

G = - (5/11)