a=(-\frac{2}{3}):2^3-(1\frac{1}{3}-2*1\frac{3}{8})=
=-\frac{2}{3}*\frac{1}{8}-(\frac{4}{3}-\frac{22}{8})=-\frac{1}{12}-(\frac{32}{24}-\frac{66}{24})=
=-\frac{1}{12}+\frac{17}{12}=\frac{4}{3}
b=\sqrt{50}:\sqrt2+(\frac{2}{5}-1)^2-\frac{(\sqrt3)^2}{0,6}=
=\sqrt{50:2}+(\frac{3}{5})^2-\frac{3}{0,6}=
=5+\frac{9}{25}-5=\frac{9}{25}
\frac{b}{a}*100\%=\frac{\frac{9}{25}}{\frac{4}{3}}*100\%=
\frac{9}{25}*\frac{3}{4}*100\%=\frac{27}{100}*100\%=27\% odp.