1. (10 points) Calculate: $\frac{1-0.75}{1.25+2 \frac{1}{4}}+\frac{4 \times 0.3+0.1}{1.8-\frac{2}{5}}=$
【Analysis】Simplify the expressions in the numerator and denominator of the complex fraction, then solve according to the basic properties of fractions.
【Solution】Solve: $\frac{1-0.75}{1.25+2 \frac{1}{4}}+\frac{4 \times 0.3+0.1}{1.8-\frac{2}{5}}$
$$
\begin{array}{l}
=\frac{0.25}{3.5}+\frac{1.3}{1.4} \\
=\frac{1}{14}+\frac{13}{14} \\
=1 ;
\end{array}
$$

Therefore, the answer is: 1.