2. Реши примеры, обозначь порядок действий:

Решение:

1. \( 10 \times (7 \times 9 - 7 \times 8) = 10 \times (63 - 56) = 10 \times 7 = 70 \)


2. \( 80 - (8 \times 4 + 8 \times 6) = 80 - (32 + 48) = 80 - 80 = 0 \)


3. \( 5 \times 4 : 10 + 58 = 20 : 10 + 58 = 2 + 58 = 60 \)


4. \( 18 : 9 \times (8 + 42) = 2 \times 50 = 100 \)


5. \( 130 - 5 \times 8 + 8 \times 6 = 130 - 40 + 48 = 90 + 48 = 138 \)


6. \( 24 : (200 - 196) = 24 : 4 = 6 \)


7. \( (71 - 66) \times (14 - 8) = 5 \times 6 = 30 \)


8. \( (23 - 14) \times (42 - 34) = 9 \times 8 = 72 \)

Ответ: 70, 0, 60, 100, 138, 6, 30, 72.