Ответ:

\(\frac{9}{12}+\frac{16}{20}=\frac{3}{4}+\frac{4}{5}=\frac{31}{20}\).

\(\frac{3}{6}-\frac{2}{8}+\frac{6}{12}=\frac{1}{2}-\frac{1}{4}+\frac{1}{2}=\frac{3}{4}\).

Ответ: \(\frac{9}{12}+\frac{16}{20}>\frac{3}{6}-\frac{2}{8}+\frac{6}{12}\).