Пошаговое объяснение:
3) 42 / 14 = 3
80 / 16 = 5
57 / 19 = 3
90 / 45 = 2
82 / 41 = 2
72 / 18 = 4
4) x * (75/5) = 30
75x / 5x = 30
15x = 30
x = 30 / 15
x = 2
Проверка:
2 * (75 / 5) = 30
2 * 15 = 30
30 = 30
