г) 3·7/8·4/5 - 1·5/8·4/5

\( 3 \cdot \frac{7}{8} \cdot \frac{4}{5} - 1 \cdot \frac{5}{8} \cdot \frac{4}{5} = \frac{84}{40} - \frac{20}{40} = \frac{64}{40} = \frac{8}{5} \approx 1,6 \)