Le 1 svp urgent aider moi

A = 7/9 + 2/3 - 1/9
A = 6/9 +2/3
A = 3x2/3x3 + 2/3
A = 2/3 + 2/3
A = 4/3

B = 9/2 - 3/4 + 1/4
B = 9/2 -2/4
B = 9/2- 1/2
B = 8/2
B = 4

C = 7 -1/5 - 3/10
C = 7 -2/10 - 3/10
C = 7 - 5/10             avec 5/10= 5/(2x5) = 1/2
C = 7 -1/2             
C = 14/2 - 1/2
C = 13/2

D = 14/6 - 5/6 + 1
D = 9/6 + 1
D = 3x3/(3x2) + 1
D = 3/2 + 2/2
D = 5/2