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Réponse :

Explications étape par étape

Bonsoir

Voir pièce jointe

2/3 - 1/3 = 1/3

2/3 - 3/4 = (2 x 4)/(3 x 4) - (3 x 3)/(4 x 3) = 8/12 - 9/12 = (-1/12)

2/3 - 3/2 = (2 x 2)/(3 x 2) - (3 x 3)/(3 x 2) = 4/6 - 9/6 = (-5/6)

2/3 - 2/5 = (2 x 5)/(3 x 5) - (2 x 3)/(5 x 3) = 10/15 - 6/15 = 4/15

1/4 - 1/3 = 3/12 - 4/12 = (-1/12)

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

1/4 - 3/2 = 1/4 - 6/4 = (-5/4)

1/4 - 2/5 = 5/20 - 8/20 = (-3/20)

4/5 - 1/3 = 12/15 - 5/15 = 7/15

4/5 - 3/4 = 16/20 - 15/20 = 1/20

4/5 - 3/2 = 8/10 - 15/10 = (-7/10)

4/5 - 2/5 = 2/5