1. (5 points) $10 \div(2 \div 0.3) \div(0.3 \div 0.04) \div(0.04 \div 0.05)=$
【Solution】Solve: $10 \div(2 \div 0.3) \div(0.3 \div 0.04) \div(0.04 \div 0.05)$
$$
\begin{array}{l}
=10 \div 2 \times 0.3 \div 0.3 \times 0.04 \div 0.04 \times 0.05 \\
=(10 \div 2) \times(0.3 \div 0.3) \times(0.04 \div 0.04) \times 0.05 \\
=5 \times 1 \times 1 \times 0.05 \\
=0.25
\end{array}
$$

Therefore, the answer is: 0.25.