bonjour j'ai besoin d'aide svp ​

Réponse:

Exercice 1) 9-4=5

5x2=10

D = 10

E = 49/7 + 12

49/7 = 7

7+12 = 19

Exercice 2)

A =2.3 x 2 + 1.8 x 3 - (1.9+0.1)

A =2.3 x 2 + 1.8 x 3 - 2

A = 4.6 + 1.8 x 3 - 2

A = 4.6 + 5.2 - 2

A = 9.8 - 2

A = 7.8

B = 2 x [5 + 2 x (2.5 + 3 x (4.9 - 2.9))]

B = 2 x [5 + 2 x (2.5 + 3 x 2.9)]

B = 2 x [5 + 2 x (2.5 + 8.7)]

B = 2 x (5 + 2 x 11.2)

B = 2 x (5 + 22.4)

B = 2 x 27.4

B = 54.8

C = 49+7

––––

6 + 1

C = 56

––––

7

C = 56/7

C = 8

D = 4+5

————

12- 9

——

2+1

D = 4+5

————

12- 9

——

3

D = 4+5

————

12- 3

D = 4+5

————

9

D = 9

————

9

D = 1