Вычисли: 3 3/7:1 11/21.

\[3\frac{3}{7}\ :1\frac{11}{21} = \frac{24}{7}\ :\frac{32}{21} = \frac{24}{7} \cdot \frac{21}{32} =\]

\[= \frac{3 \cdot 3}{1 \cdot 4} = \frac{9}{4} = 2\frac{1}{4}.\]