👤

Bonsoir, j’aurai besoin d’aide pour l’exercice 69


Bonsoir Jaurai Besoin Daide Pour Lexercice 69 class=

Répondre :

Bonsoir,

a)

3-2/3 = 9/3 -2/3 = 7/3

4/3 * 7 = 28/3

=> (7/3 )/ (28/3)

= 7/3 * 3/28

= 21/84 = 7/28 = 1/4

erreur corrigée

b)

(2/3)/ (5/6 ) -2/5

= 2/3 * 6/5 -2/5

= 12/15 -2/5

= 12/15- 6/15

=6/15 =2/5

c)

-3/4 +1/2 = -3/4 + 2/4 = -1/4

2/5 -5/2 = 4/10 - 25/10 = -21/10

(-1/4) / (-21/10 ) = (1/4)/ (21/10)

= 1/4 * 10/21

= 10/ 84 = 5/42