Ответ:
13)
\( \frac{2}{5}m^5n^4 1.5n^3 (-m) = (\frac{2}{5} 1.5 -1)m^{5+1}n^{4+3} = (\frac{2}{5} \frac{3}{2} -1)m^6n^7 = (\frac{3}{5} -1)m^6n^7 = -\frac{3}{5}m^6n^7 \)13)
\( \frac{2}{5}m^5n^4 1.5n^3 (-m) = (\frac{2}{5} 1.5 -1)m^{5+1}n^{4+3} = (\frac{2}{5} \frac{3}{2} -1)m^6n^7 = (\frac{3}{5} -1)m^6n^7 = -\frac{3}{5}m^6n^7 \)