2. Решение примеров с обозначением порядка действий:
- \( 10 \times (7 - 9 - 7 \times 8) = 10 \times (7 - 9 - 56) = 10 \times (-2 - 56) = 10 \times (-58) = -580 \)
- \( 80 - (8 \times 4 + 8 \times 6) = 80 - (32 + 48) = 80 - 80 = 0 \)
- \( 5 \times 4 : 10 + 58 = 20 : 10 + 58 = 2 + 58 = 60 \)
- \( 18 : 9 \times (8 + 42) = 2 \times 50 = 100 \)
- \( 130 - 5 \times 8 + 8 \times 6 = 130 - 40 + 48 = 90 + 48 = 138 \)
- \( 24 : (200 - 196) = 24 : 4 = 6 \)
- \( (71 - 66) \times (14 - 8) = 5 \times 6 = 30 \)
- \( (23 - 14) \times (42 - 34) = 9 \times 8 = 72 \)
Ответ: -580; 0; 60; 100; 138; 6; 30; 72.