70-(81-39):7+6•7-90: 5 + 85:17 =

Решение:

1. \( 81 - 39 = 42 \)
2. \( 42 : 7 = 6 \)
3. \( 6 \cdot 7 = 42 \)
4. \( 90 : 5 = 18 \)
5. \( 85 : 17 = 5 \)
6. \( 70 - 6 = 64 \)
7. \( 64 + 42 = 106 \)
8. \( 106 - 18 = 88 \)
9. \( 88 + 5 = 93 \)

Ответ: 93