aider moi svp ses urgenttt ses le numéro 54 et 56

Ex 54

A= 17/18 + 3x1/6 
A= 17/18 + 9/18
A= 27/18 
A = 3/2

B= 14/11 - 2/11x5
B= 14/11-10/11
B= 4/11

C= 1-(5/8 - 1/4)
C=1- ( 5/8-2/8)
C= 1-3/8
C= 8/8 - 3/8
C=5/8

D= ( 3/4 x16/9) -(10/6x1/6)
D= (3x4x4 / 4x3x3) - ( 2x5x1 / 2x18 )
D= 4/3 - 5/18
D= 24/18 - 5/18  
D= 19/18

54)
A = 17/18 + 3 x 1/6
A = 17/18 + 3/6
A = 17/18 + 3 x 3 / 6 x 3
A = 17/18 + 9/18
A = 26/18
A = 2 x 13 / 2 x 9
A = 13/9

B = 14/11 - 2/11 x 5
B = 14/11 - 10/11
B = 4/11

C = 1 - (5/8 - 1/4)
C = 1 x 8 / 1 x 8 - (5/8 - 1 x 2 / 4 x 2)
C = 8/8 - (5/8 - 2/8)
C = 8/8 - 3/8
C = 5/8

D = 3/4 x 16/9  je vois pas la fin

56)
a) p - (m + n)
= 5/18 - (3/4 + 11/8)
= 5/18 - (3 x 2 / 4 x 2 + 11/8)
= 5/18 - (6/8 + 11/8)
= 5/18 - 17/8
= 5 x 4 / 18 x 4 - 17 x 9 / 8 x 9
= 20/72 - 153/72
= - 133/72