4. Calculate: 60 * (19 - 14) + 51 = 63 99 : (64 : 2 + 37) = 8 + (52 : 2 + 4) = 38 55 - 90 : (27 : 3 + 18) = 45

Решение:

1. \( 60 \times (19 - 14) + 51 = 60 \times 5 + 51 = 300 + 51 = 351 \)
2. \( 99 : (64 : 2 + 37) = 99 : (32 + 37) = 99 : 69 = 1 \) (остаток \( 30 \))
3. \( 8 + (52 : 2 + 4) = 8 + (26 + 4) = 8 + 30 = 38 \)
4. \( 55 - 90 : (27 : 3 + 18) = 55 - 90 : (9 + 18) = 55 - 90 : 27 = 55 - 3 \) (остаток \( 9 \))

Ответ: 351; 1 (ост. 30); 38; 3 (ост. 9).