Réponse :

Explications étape par étape

Bonjour,

Exercice 35

13/8 + 4/1 = 13/8 + 32/8 = 45/8

10/1 - 9/8 = 80/8 - 9/8 = 71/8

11/2 -5/1 = 11/2 - 10/2 = 1/2

5/9 + 1/1 = 5/9 + 9/9 = 14/9

Exercice 36

20/6- 12/6 =  8/6 = 4/3

56/7 - 1/7 = 55/7

65/5 +7/5 = 72/5

21/5

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35)

a. 13/8 + 4 = 13/8 + (4 x 8) / (1 x 8) = 13/8 + 32/8 = 45/8

b. 10 - 9/8 = (10 x 8) / (1 x 8) - 9/8 = 80/8 - 9/8 = 71/8

c. 11/2 - 5 = 11/2 - (5 x 2) / (1 x 2) = 11/2 - 10/2 = 1/2

d. 5/9 + 1 = 5/9 + (1 x 9) / (1 x 9) = 5/9 + 9/9 = 14/9

36)

a. 20/6 - 2 = 20/6 - (2 x 6) / (1 x 6) = 20/6 - 12/6 = 8/6 = (2 x 4) / (2 x 3) = 4/3

b. 8 - 1/7 = (8 x 7) / (1 x 7) - 1/7 = 56/7 - 1/7 = 55/7

c. 13 + 7/5 = (13 x 5) / (1 x 5) + 7/5 = 65/5 + 7/5 = 72/5

d. (13 + 7) / 5 = 20/5 = 4