(-10 $\frac{1}{5}$ - 5 $\frac{3}{4}$ ) - ( $\frac{1}{4}$ - 0,2)

$$\eqalign{ & \left( { - 10{1 \over 5} - 5{3 \over 4}} \right) - \left( {{1 \over 4} - 0,2} \right) \cr & = \left( { - 15{{19} \over {20}}} \right) - \left( {{1 \over 4} - {1 \over 5}} \right) \cr & = - {{15.20 + 19} \over {20}} - {1 \over {20}} \cr & = {{ - 319} \over {20}} - {1 \over {20}} = - {{320} \over {20}} = - 16 \cr}$$

$\begin{array}{l} \left( { - 10\frac{1}{5} - 5\frac{3}{4}} \right) - \left( {\frac{1}{4} - 0,2} \right)\\ = \left( { - \frac{{51}}{5} - \frac{{23}}{4}} \right) - \left( {\frac{1}{4} - \frac{1}{5}} \right)\\ = - \frac{{319}}{{20}} - \frac{1}{{20}}\\ = - \frac{{320}}{{20}} = - 16. \end{array}$