\(\frac{1}{2}\cdot\frac{
ot5}{
ot8_2}\cdot\frac{
ot4}{
ot5}=\frac{1}{2}\cdot\frac{1}{2}\cdot\frac{1}{1}=\frac{1}{2\cdot2}=\boxed{\frac{1}{4}}\\\\-\frac{\frac{3}{8}}{\frac{3}{4}}=-\frac{3}{8}:\frac{3}{4}=-\frac{
ot3}{8}\times\frac{4}{
ot3}=-\frac{4}{8}=\boxed{-\frac{1}{2}}\\\\-\frac{\frac{16}{9}}{8}=-\frac{16}{9}:8=-\frac{
ot16^2}{9}\times\frac{1}{
ot8}=\boxed{-\frac{2}{9}}\)
