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Sagot :

Réponse :

A = (1 - 5/6)/(1 + 1/6)

  = (6/6 - 5/6)/(6/6 + 1/6)

  = 1/6/7/6

  = 1/7

B = (1/5 - 5/4) ÷ 7/5

  = (4/20 - 25/20) ÷ 7/5

  = - 21/20 ÷ 7/5

  = - 21 x 5/7 x 20

  = - 3 x 7 x 5/7 x 4 x 5

  = - 3/4

Explications étape par étape :

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