\frac{1}{8}*\sqrt[3]8-4^{-1}*4
15%=0,15
\frac{1}{8}*\sqrt[3]8-4^{-1}*4=
\frac{1}{8}*2-\frac{1}{4}*4=\frac{1}{4}-1=-\frac{3}{4}
0,15=\frac{15}{100}=\frac{3}{20}
\frac{3}{20}*(-\frac{3}{4})=-\frac{9}{80}