\[\boxed{\mathbf{5}\mathbf{.}}\]
\[= \frac{170}{50} \bullet \frac{43}{20} + \frac{238}{80} \bullet \frac{2}{5} =\]
\[= \frac{17 \bullet 43}{5 \bullet 20} + \frac{119}{20 \bullet 5} =\]
\[= \frac{731 + 119}{100} = \frac{850}{100} = 8,5\]
\[= \frac{13}{10} + \frac{250}{4 \bullet 25} + \frac{4}{2} =\]
\[= 1,3 + \frac{250}{100} + 2 =\]
\[= 3,3 + 2,5 = 5,8\]