Bonjour ! J'espère vous aider !
Réponse :
n°10 :
L = 5/7 / 15/2
L = 5/7 * 2/15
L = 10/105
L = 2/21
M = 5/3 / 7/9
M = 5/3 * 9/7
M = 45/21
M = 15/7
N = 12/5 / 6/7
N = 12/5 * 7/6
N = 84/30
N = 14/5
P = 18/4 / 6/8
P = 18/4 * 8/6
P = 144/24
P = 6
R = 2,7/0,15 / 3/0,25
R = 2,7/0,15 * 0,25/3
R = 0,675/0,45
R = 27/40
S = 12/18 / 4/45
S = 12/18 * 45/4
S = 540/72
S = 15/2