Реши примеры: 1. 54 : 6 – 9 2. 48 : 6 – 7 3. 42 : 6 – 5 4. 2 · 7 + 6 · 9 5. 3 · 7 + 6 · 8 6. 4 · 7 + 6 · 7 7. 5 · (16 – 8) 8. 6 · (15 – 8) 9. 7 · (14 – 8)

Решение:

1. \( 54 : 6 - 9 = 9 - 9 = 0 \)


2. \( 48 : 6 - 7 = 8 - 7 = 1 \)


3. \( 42 : 6 - 5 = 7 - 5 = 2 \)


4. \( 2 \cdot 7 + 6 \cdot 9 = 14 + 54 = 68 \)


5. \( 3 \cdot 7 + 6 \cdot 8 = 21 + 48 = 69 \)


6. \( 4 \cdot 7 + 6 \cdot 7 = 28 + 42 = 70 \)


7. \( 5 \cdot (16 - 8) = 5 \cdot 8 = 40 \)


8. \( 6 \cdot (15 - 8) = 6 \cdot 7 = 42 \)


9. \( 7 \cdot (14 - 8) = 7 \cdot 6 = 42 \)

Ответ: 0, 1, 2, 68, 69, 70, 40, 42, 42.