Réponse :

A = 4/3 - 2/3 x 5/8   ordre de priorité la x

  = 4/3) - 5/12

  = 16/12 - 5/12

  = 11/12

B = (4 - 2/3)(2 - 4/3)

  = (12/3 - 2/3)(6/3 - 4/3)

  = 10/3 x 2/3

  = 20/9

C = (2/3 - 1/4)/(2/3 + 1/4)

   = (8/12 - 3/12)/(8/12 + 3/12)

   = 5/12/11/12

   = 5/11  

D = (- 7/5 + 4/3) ÷ (7 - 4/3)

   = (-21/15 + 20/15) ÷ (21/3 - 4/3

   = - 1/15/17/3

   = - 1/85

E = 2/3  - 5/3 x (1 - 1/5)

  = 2/3  - 5/3 x 4/5

  = 2/3 - 4/3

  = - 2/3    

Explications étape par étape :