Ответ:
\(\frac{4}{7}:\frac{16}{21}=\frac{4}{7}\cdot\frac{21}{16}=\frac{3}{4}\).
\(2\frac{1}{4}=\frac{9}{4}\).
\(\frac{3}{4}+\frac{9}{4}=\frac{12}{4}=3\).
Ответ: 3.
\(\frac{4}{7}:\frac{16}{21}=\frac{4}{7}\cdot\frac{21}{16}=\frac{3}{4}\).
\(2\frac{1}{4}=\frac{9}{4}\).
\(\frac{3}{4}+\frac{9}{4}=\frac{12}{4}=3\).
Ответ: 3.