Bonsoir,

Ex 34:

a) 7 x 15/5 = 7 x (5 x 3) / 5 = 7 x 3 = 21

b) 12 x 14/3 = 12/3 x 14 = 4 x 14 = 56

c) 25 x 6/5 = 25/5 x 6 = 5 x 6 = 30

Ex 35:

a) 27 x 14/9 = 27/9 x 14 = 3 x 14 = 42

b) 8 x 16/4 = 8 x (4 x 4) / 4 = 8 x 4 = 32

c) 66 x 9/11 = 66/11 x 9 = 6 x 9 = 54

Ex 36:

a) 2,7 x 10/3 = 27/30 x 10 = (9 x 3) / (3 x 10) x 10 = 9/10 x 10 = 9

b) 200 x 3/100 = 200/100 x 3 = 2 x 3 = 6

c) 54 x 2/6 = 54/6 x 2 = 9 x 2 = 18

Ex 37:

a) 2/7 x 7 = 2 x 7/7 = 2

b) 9 x 4/3 = 9/3 x 4 = 3 x 4 = 12

c) 36 x 7/6 = 36/6 x 7 = 6 x 7 = 42

d)25 x 12/5 = 25/5 x 12 = 5 x 12 = 55 + 5 = 60

e) 12 x 8/6 = 12/6 x 8 = 2 x 8 = 16

f) 11/50 x 100 = 11 x 100/50 = 11 x 2 = 22

Bonne soirée.

Thomas

Réponse :

Bonsoir

Explications étape par étape

exercice 34

7 X 15/5 = 105/5 = 21

12 X 14/3 = 168/3 = 56

25 X 6/5 = 150/5 = 30

Exercice 35

27 X 14/9 = 42

8 X 16/4 = 32

66 X 9/11 = 54

Exercice 36

2,7 X 10/3 = 27/3 = 9

200 X 3/100 = 600/100 = 6

54 X 2/6 = 108/6 = 18

Exercice 37

2/7 X 7 = 14/7 = 2

9 X 4/3 = 36/3 = 12

36 X 7/6 = 252/6 = 42

25 X 12/5 = 60

12 X 8/6 = 16

11/50 X 100 = 22