A= 7/8- 5/6+ 11/123
A= 21/24- 20/24+ 22/24
A= -21/24= 7/8
B= 8-1/3 +2/6
B= 48/6- 2/6+ 2/6
B= 48/6 et on va simplifier-2/6 et 2/6 car se sont des nombres opposé.
B=8.
C= 5/14×21/2
C= 5/2×3/2
C= 15/4
D= 1-(1/3+1/4)×2/5
D= 1-(4/12+3/12)×2/5
D= 1-7/12×2/5
D= 1-7/6×1/5
D= 1-7/30
D=30/30-7/30
D= 23/30
E= 3/2-1/3
3/4+1/2
E=9/6-2/6
3/4+2/4
E= 7/6
5/4
E= 7/6×4/5
E= 28/30
E= 14/15