Bonjour aidez moi svp sa fait 2 jours que j'essaie jy arrive pas

Bonsoir,

A = (- 10/9 - 6) / (5/9 + 3)

A = [- 10/9 - (6 x 9) / (1 x 9)] : [5/9 + (3 x 9) / (1 x 9)]

A = (- 10/9 - 54/9) : (5/6 + 27/9)

A = - 64/9 : 32/9

A = - 64/9 x 9/32

A = - 576/288

A = (288 x - 2) / (288 x 1)

A = - 2

B = 8/9 : (- 12/11 - - 7/6)

B = 8/9 : [(- 12 x 6) / (11 x 6) + (7 x 11) / (6 x 11)]

B = 8/9 : (- 72/66 + 77/66)

B = 8/9 : 5/66

B = 8/9 x 66/5

B = 528/45

B = (3 x 176) / (3 x 15)

B = 176/15

C = - 25 - - 20/9 : - 20/9

C = - 25 + 20/9 x - 9/20

C = - 25 - 180/180

C = - 25 - 1

C = - 26.