Bonsoir,
D = (2 + 3/4)*1/2 +3/4 -3/7 -8/9/8/9 -3/7
D = (8/4 + 3/4)*1/2 +3/4 -3/7 -1 - 3/7
D = (11/4)*1/2 +3/4 -1 - 6/7
D = 11/8 + 3/4 - 1 - 6/7
D = 77/56 +42/56 - 56/56 - 48/56
D = 15/56
E = (1 - 1/2)(1 - 2/2)(1 - 3/2)(1- 4/2)(1 - 5/2)(1 - 6/3)/1-1/2
E = (1 - 1/2)(0)(1 - 3/2)(1- 4/2)(1 - 5/2)(1 - 6/3)/1-1/2
E = 0
Bonne chance