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
