Trouve les nombres manquants :

13 - 9 = .......... + 0 = 24
20 + 17 = .......... : 4 = 9
17 + ..... = 36..... - 15 = 17
25 - ..... = 717 + ..... = 19
60 : 6 = .....28 - 15 = .....
4 + 9 = .....18 + 3 = .....
3 + ..... = 1836 - 14 = .....
15 + 20 = .......... : 6 = 5
..... + 18 = 20..... × 4 = 28
31 - 17 = .....20 - ..... = 7