exercice 11, 12, 13, 14 et 15 svp :)

15)
A = (5 x 2) + 3,7
A = 10 + 3,7
A = 13,7

B = 4 x (9,2 + 7)
B = 4 x ( 16,2)
B = 64,8

C = 17 - (4 x 3)
C = 17 - 12
C = 5

D = (1,9 + 3,11)/11
D = 5,01/11


13)
a) 4 x 2 + 9 = 44
4 x (2 + 9) = 44
4 x 11 = 44

b) 15 - 3 x 2 = 24
(15 - 3) x 2 = 24
12 x 2 = 24

d) 1 + 13 - 14 - 7 = 7
(1 + 13) - (14 - 7) = 7
14 - 7 = 7

e) 7 + 7 + 6 x 7 = 98
7 + [(7 + 6 )x 7] = 98
7 + (13 x 7) = 98
7 + 91 = 98