exo 3 depechez jai besoin daide rapidement!

A = (- 2/26 + 2/13) : 8/13

A = (- 2/26 + 2 x 2 / 13 x 2) : 8/13

A = (- 2/26 + 4/26) : 8/13

A = 2/26 : 8/13

A = 2/26 x 13/8

A = 26/208

A = 26 x 1 / 26 x 8

A = 1/8

B = 3 - 1/4

     - 3 + 1/8

B = 3 x 4 / 1 x 4 - 1/4

     - 3 x 8 / 1 x 8 - 1/8

B = 12/4 - 1/14

      - 24/8 - 1/8

B = 11/4 : - 25/8

B = 11/4 x - 8/25

B = - 88/100

B = 4 x - 22 8/ 4 x 25

B = - 22/25

C = 1/4 + 5/2 x 3/45

          5/6 + 5/4

C =              1/4 + 15/90______

       5 x 2 / 6 x 2 + 5 x 3 / 4 x 3

C = 1 x 90 / 4 x 90 + 15 x 4 / 90 x 4

                 10/12 + 15/12

C = 90/360 + 60/360

             25/12

C = 150/360 : 25/12

C = 150/360 x 12/25

C = 1800/9000

C = 1800 x 1 / 1800 x 5

C = 1/5