$9.0 .18 \times 0.81+0.18+0.81=(\quad)$ .



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$9.0 .18 \times 0.81+0.18+0.81=(\quad)$ .
$$
\begin{aligned}
\text { Original expression } & =\frac{18}{99} \times \frac{81}{99}+\frac{18}{99}+\frac{81}{99} \\
& =\frac{2}{11} \times \frac{9}{11}+\frac{2}{11}+\frac{9}{11} \\
& =\frac{18+22+99}{121} \\
& =\frac{139}{121}
\end{aligned}
$$