2. Calculate: $\left[20.75+\left(3.74-2 \frac{1}{2}\right) \div 9 \frac{23}{25}\right] \div 41.75=$
2. Solution: Original expression $=\left[20.75+1.24 \times \frac{25}{248}\right] \div 41.75=[20.75+0.125] \div 41.75=20.875 \div 41.75=0.5$