N 24

Решение:

1. \( 2 \times (81 - 72) = 2 \times 9 = 18 \)

2. \( 3 + 4 \times 4 : 2 + (84 - 26) = 3 + 16 : 2 + 58 = 3 + 8 + 58 = 69 \)

3. \( 53.5 + 1640 : 3 + 984846 - 24479 = 53.5 + 546.67 + 984846 - 24479 \approx 960971.17 \)