2. Вычислите. 31+44 28+18 40-19 71-(21+40) 58+(35-35) 23+(47-40)

Решение:

1. \( 31 + 44 = 75 \)
2. \( 28 + 18 = 46 \)
3. \( 40 - 19 = 21 \)
4. \( 71 - (21 + 40) = 71 - 61 = 10 \)
5. \( 58 + (35 - 35) = 58 + 0 = 58 \)
6. \( 23 + (47 - 40) = 23 + 7 = 30 \)

Ответ: 75, 46, 21, 10, 58, 30.