bonsoir es ce que vous pourriez m'aidez svp je doit le rendre demain donc merci d'avance ​

Bonjour,

A = 9/7 - 2/7 x 1/5

A = 9/7 - 2/35

A = (9 x 5) / (7 x 5) - 2/35

A = 45/35 - 2/35

A = 43/35

B = 15/9 - 5 x 2/3

            15/4

B = 15/9 - 10/3

          15/4

B = 15/9 - (10 x 3) / (3 x 3)

               15/4

B = 15/9 - 30/9

         15/4

B = - 15/9 : 15/4

B = - 15/9 x 4/15

B = - 60/135

B = (15 x - 4) / (15 x 9)

B = - 4/9.

C = (1/12 + 2/96) x (- 1/4)

C = [(1 x 4) / (12 x 4) + (2 x 1) / (2 x 48)] x (- 1/4)

C = (4/48 + 1/48) x (- 1/4)

C = 5/48 x (- 1/4)

C = - 5/192.

Réponse :

Explications étape par étape

Bonjour

A = 9/7 - 2/7 x 1/5

A = 9/7 - 2/35

A = 45/35 - 2/35

A = 43/35

B = (15/9 - 5 x 2/3)/(15/4)

B = (15/9 - 10/3) x 4/15

B = (15/9 - 30/9) x 4/15

B = (-15/9) x 4/15

B = (-15/15) x 4/9

B = (-1) x 4/9

B = -4/9

C = (1/12 + 2/96) x (-1/4)

C = (8/96 + 2/96) x (-1/4)

C = 10/96 x -1/4

C = 10/4 x -1/96

C = 5/2 x -1/96

C = -5/192