1. Calculate: $(2021+202.1+20.21+2.021) \div 2020 \times 1 \frac{9}{11}=$
【Answer】 2.021
$$
\begin{aligned}
\text { 【Analysis】Original expression } & =2.021 \times(1000+100+10+1) \times \frac{1}{2020} \times \frac{20}{11} \\
& =2.021 \times 1111 \times \frac{1}{101} \times \frac{1}{11} \\
& =2.021
\end{aligned}
$$