bonjour
C = 2/3 + 3/12
C = 8/12 + 3/12 = 11/12
D = ( 1/9 + 3/9) : 2/15
= 4/9 x 15/2
= 60/18= 30/9
E = - 3/8 - 1/3 * 3/4
= - 3/8 - 3/12
= - 9/24 - 6/24 = - 15/24
F = ( 3/12 - 4/12) x ( 3/4 - 6/4)
= - 1/2 * - 3/4
= 3/8
proba verte = 1 - ( 0.3 + 0.25 + 0.2) = 1 - 0.75 = 0.25
proba rouge ou verte = 0.3 + 0.25 = 0.28
lucie = x
nicolas = x + 14
x + x + 14 = 68
2 x = 68 - 14
2 x = 54
x = 27
lucie = 27 et nicolas = 41