Je dois faire le 13,14,16,17 pour demain hellpppmee please

13)
A = (- 4) x (- 5)
A = 20

B = - 4 - 5
B = - 9

C = - 7 + 3
C = - 4

D = - 3 - 7
D = - 10

E = - 3 + 7
E = 4

F = - 3 x (- 7)
F = 21

14)
a) - 36/12 = 12 x (- 3) / 12 x 1 = - 3
b) - 49/7 = 7 x (- 7) / 7 x 1 = - 7
c) 56/- 8 = - 56/8 = 8 x - 7 / 8 x 1 = - 7
d) - 45/- 9= 45/9 = 9 x 5 / 9 x 1 = 5
e) 11/- 1 = - 1/11
f) - 24/ - 8 = 24/8 = 8 x 3 / 8 x 1 = 3

15)
a) 2/- 3 = - 2/3
b) (- 1 - 1) / 3 = - 2/3

On ne voit pas le 16 et le 17