\[\displaystyle K = \left\{\left[\left(3\tfrac{1}{4}-1\tfrac{1}{2}\right)\cdot\tfrac{4}{7}\right]\cdot\left[\left(30-28\tfrac{1}{3}\right)\cdot\tfrac{1}{6}\right]\right\}\cdot\left[\left(3\tfrac{1}{2}:1\tfrac{3}{4}\right):\left(1\tfrac{1}{3}:6\tfrac{2}{3}\right)\right]-\tfrac{7}{9}\]

\[\displaystyle L = 57:\left\{12\tfrac{3}{4}-\left[\frac{\left(16\tfrac{2}{3}-4\tfrac{2}{3}\right):1\tfrac{1}{2}+34\tfrac{2}{3}:4\tfrac{1}{3}}{3\tfrac{3}{5}:\dfrac{9}{5}+\dfrac{1}{2}:\dfrac{1}{4}-8\tfrac{4}{5}:4\tfrac{2}{5}}\right]\right\}\]

\[\displaystyle M = \frac{1}{\left(1:\dfrac{3}{5}-1:3\dfrac{3}{7}\right):2\dfrac{3}{4}}+\frac{(0{,}5)^3-\dfrac{1}{8}+(0{,}1)^2}{(0{,}4)^3+0{,}936}\cdot 10^2\]

\[\displaystyle N = \frac{\left(2\tfrac{1}{4}-1\right):5+\left(2\tfrac{3}{4}-1\right):7+\left(2\tfrac{3}{8}-1\right):5\tfrac{1}{2}}{\dfrac{1}{2\tfrac{2}{3}}+\dfrac{1}{1\tfrac{3}{5}}-\dfrac{1}{1\tfrac{1}{7}}}\]