Задание 3. Реши уравнения: 5 + a = 22; a − 22 = 5; a − 17 = 7; 51 + a = 22; 97 − b = 69; b − 17 = 69; b − 28 = 69; 45 : c = 9; c · 9 = 45; c : 5 = 9; 4 · d = 36; d : 6 = 16; d · 6 = 40; 6 : d = 40; 36 : d = 9.

Решаем уравнения, используя обратные действия:

1. \(5+a=22\), \(a=22-5=17\).
2. \(a-22=5\), \(a=5+22=27\).
3. \(a-17=7\), \(a=7+17=24\).
4. \(51+a=22\), \(a=22-51=-29\).
5. \(97-b=69\), \(b=97-69=28\).
6. \(b-17=69\), \(b=69+17=86\).
7. \(b-28=69\), \(b=69+28=97\).
8. \(45:c=9\), \(c=45:9=5\).
9. \(c\cdot9=45\), \(c=45:9=5\).
10. \(c:5=9\), \(c=9\cdot5=45\).
11. \(4\cdot d=36\), \(d=36:4=9\).
12. \(d:6=16\), \(d=16\cdot6=96\).
13. \(d\cdot6=40\), \(d=40:6=\frac{20}{3}\).
14. \(6:d=40\), \(d=6:40=\frac{3}{20}\).
15. \(36:d=9\), \(d=36:9=4\).

Ответ: a = 17; 27; 24; −29; b = 28; 86; 97; c = 5; 5; 45; d = 9; 96; \(\frac{20}{3}\); \(\frac{3}{20}\); 4.