Svp j'en est besoin au plus vite

A = 1/9 - 15/9 x 1/6
A = 1/9 - 15/54
A = 1 x 6 / 9 x 6 - 15/54
A = 6/54 - 15/54
A = - 9/54
A = 9 x - 1 / 9 x 6
A = - 1/6

B = (3/5 - 1/2) x 5/2
B = (3 x 2 / 5 x 2 - 1 x 5 / 2 x 5) x 5/2
B = (6/10 - 5/10) x 5/2
B = 1/10 x 5/2
B = 5/20
B = 5 x 1 / 5 x 4
B = 1/4

C = 5/3 - 2/3 : 5/6
C = 5/3 - 2/3 x 6/5
C = 5/3 - 12/30
C = 5 x 10 / 3 x 10 - 12/30
C = 50/30 - 12/30
C = 38/30
C = 2 x 19 / 2 x 15
C = 19/15