6. 45+69-90 20-28+66 51-85-11 81:9-7 32:4.6 49:7.8

1. $$45 + 69 - 90 = 114 - 90 = 24$$


2. $$20 - 28 + 66 = -8 + 66 = 58$$


3. $$51 - 85 - 11 = -34 - 11 = -45$$


4. $$81 : 9 - 7 = 9 - 7 = 2$$


5. $$32 : 4 \cdot 6 = 8 \cdot 6 = 48$$


6. $$49 : 7 \cdot 8 = 7 \cdot 8 = 56$$

Ответ: 24, 58, -45, 2, 48, 56