Exercice 1
Si a = 9 alors 20 – a = 11
Si n = 13 alors n – 7 = 6
Si y = 4 alors 2 + y = 6
Si x = 6 alors 8x = 48
Si n = 7 alors 6 + n = 13
Si y = 1 alors y + 6 = 7
Si z = 4 alors z² = 16
Si x = 7 alors x² = 49
Si n = 10 alors n² = 100
Si a = 3 alors 21 – a = 18
Si n = 1 alors 4 – n = 3
Si x = 7 alors x + 8 = 15
Si x = 19 alors x – 5 = 14
Si y = 8 alors y² = 64
Exercice 2
29 + 29 = 58
21 + 29 = 50
49 – 19 = 30
62 – 39 = 23
19 + 46 = 65
12 + 39 = 51
14 + 9 = 23
26 + 19 = 45
40 + 49 = 89
85 – 49 = 36
70 – 39 = 31
26 + 29 = 55
53 – 19 = 34
30 + 9 = 39
74 – 49 = 25
63 – 19 = 44
19 + 45 = 64
31 + 49 = 80
19 + 19 = 38
20 + 29 = 49