\frac{3}{5}-\frac{1}{2}:(4\frac{2}{10}):1\frac{1}{5}=
coś mi się tu nie zgadza zapis, jak to ma wyglądać
\frac{3}{5}-\frac{1}{2}:(4\frac{2}{10}):1\frac{1}{5}=\frac{3}{5}-\frac{1}{2}:(4\frac{1}{5}):1\frac{1}{5}=\frac{3}{5}-\frac{1}{2}:\frac{21}{5}:\frac{6}{5}=
\frac{3}{5}-\frac{1}{2}*\frac{5}{21}*\frac{5}{6}=\frac{3}{5}-\frac{25}{252}=\frac{756-125}{1260}=\frac{631}{1260}