Ответ:

\[\frac{9\cdot16}{8\cdot27}=\frac{144}{216}=\frac{2}{3}\]

\[\frac{8\cdot28}{35\cdot12}=\frac{224}{420}=\frac{8}{15}\]

\[\frac{2\cdot3\cdot5}{4\cdot9\cdot25}=\frac{30}{900}=\frac{1}{30}\]

Ответ: \(\frac{2}{3};\ \frac{8}{15};\ \frac{1}{30}\).