Решение:
- \( 2 \times 6 + 7 = 12 + 7 = 19 \)
- \( 3 \times 4 + 9 = 12 + 9 = 21 \)
- \( 7 \times 3 - 9 = 21 - 9 = 12 \)
- \( 8 \times 2 - 6 = 16 - 6 = 10 \)
- \( 81 - 18 : 3 = 81 - 6 = 75 \)
- \( (32 - 48) : 10 = -16 : 10 = -1.6 \)
Ответ: 19, 21, 12, 10, 75, -1.6.