urgent svvpp aider moi pour les 2 exo svp merci d'avance.

140/
M = 12/30 - 40/30 + 105/30 = 77/30
N = 2/3 - 15/6 = 4/6 -15/6= - 11/6
L = (-7/4 +2/4) : ( 8/28 +7/28) = -5/4 : 15/28 = -5/4  x 28/15 = - 140/60 = - 7/3
P = -28/5 x -1/21 = 28/105

Inverse de M = 30/77
opposé de N =  11/6

M - N = 77/30 -(-11/6) = 77/30 + 55/30 = 132/30 =22/5
N x L = -11/6 x -7/3 = 77/18
M : N = 77/30 : -11/6 = 77/30 x -6/11 = - 462/330 = -7/5

M.Leblanc  + Mme Lenoir = 1/3 +1/5 = 5/15 + 3/15 = 8/15
reste : 7/15
Melle Lerouge = 3/7 x 7/15 = 21/105 = 1/5
M. Levert = 1 - (8/15 + 1/5) = 1 - ( 8/15 + 3/15) = 1 - 11/15 = 15/15 - 11/15 = 4/15
4/15 représentent 1228 voix donc 15/15 = (1228 x 15)/4 = 4605 voix
Leblanc = 4605 : 3 = 1535
Lenoir = 4605 : 5 = 921
lerouge = 4605 : 5 = 921
levert = 4605 x 4/15 = 1228