61. Вставь пропущенные числа: (7 + □) : 8 = 2; (19 + □) : 9 = 3; (□□ − 4) : 7 = 8; (42 − □□) · 5 = 30; 54 : (□□ − 7) = 9; (□□ − 30) · 6 = 54.

1. \((7 + x) : 8 = 2\): \(7 + x = 16\), \(x = 9\).
2. \((19 + x) : 9 = 3\): \(19 + x = 27\), \(x = 8\).
3. \((x - 4) : 7 = 8\): \(x - 4 = 56\), \(x = 60\).
4. \((42 - x) \cdot 5 = 30\): \(42 - x = 6\), \(x = 36\).
5. \(54 : (x - 7) = 9\): \(x - 7 = 6\), \(x = 13\).
6. \((x - 30) \cdot 6 = 54\): \(x - 30 = 9\), \(x = 39\).

Ответ: 9; 8; 60; 36; 13; 39.