f)
\frac{(\frac{2}{5})^{-\frac{3}{4}}*(2\frac{1}{2})^{\frac{3}{5}}*(0,4)^{0,7}}{\sqrt{\frac{2}{5}}*(\frac{5}{2})^{0,15}}=\frac{(\frac{2}{5})^{-0,75}*(\frac{2}{5})^{-0,6}*(\frac{2}{5})^{0,7}}{(\frac{2}{5})^{0,5}*(\frac{2}{5})^{-0,15}}=
\frac{(\frac{2}{5})^{-0,75-0,6+0,7}}{(\frac{2}{5})^{0,35}}=(\frac{2}{5})^{-0,65-0,35}=(\frac{2}{5})^{-1}=\frac{5}{2}=2,5