1) Выполни вычисления. 45+7=, 64+6=, 76-9=, 30-8=, 15-(14-7)=, 12-6-4=, 70+(15-9)=, 80-(16-7)=

Решение:

1. \( 45 + 7 = 52 \)
2. \( 64 + 6 = 70 \)
3. \( 76 - 9 = 67 \)
4. \( 30 - 8 = 22 \)
5. \( 15 - (14 - 7) = 15 - 7 = 8 \)
6. \( 12 - 6 - 4 = 6 - 4 = 2 \)
7. \( 70 + (15 - 9) = 70 + 6 = 76 \)
8. \( 80 - (16 - 7) = 80 - 9 = 71 \)

Ответ: 52, 70, 67, 22, 8, 2, 76, 71.