2. (7 points) Calculate: $1.1+3.3+5.5+7.7+9.9+11.11+13.13+15.15+17.17+19.19=$
【Solution】Solution: $1.1+3.3+5.5+7.7+9.9+11.11+13.13+15.15+17.17+19.19$
$$
\begin{array}{l}
=1.1 \times(1+3+5+7+9)+1.01 \times(11+13+15+17+19) \\
=1.1 \times 25+1.01 \times 75 \\
=103.25 .
\end{array}
$$