pouvez vous m aidez svp merci

Exercice 3

V = - 12/7 x 7/5 x 5/6
V = - 84/35 x 5/6
V = - 420/210
V = 210 x - 2 / 210 x 1
V = - 2/1
V = - 2

O = 12/25 x 15/16 x 4
O = 180/400 x 4
O = 720/4
O = 4 x 180 / 4 x 1
O = 180/1
O = 180

L = 11 : (22/5)
L = 11 x 5/22
L = 55/22
L = 11 x 5 / 11 x 2
L = 5/2

E = (- 2/5) : (4/15)
E = (- 2/5) x 15/4
E = - 30/20
E = 10 x - 3 / 10 x 2
E = - 3/2