$$\left. \begin{array} { l } { 315 - ( 14 + 4 ) \times ( 18 - 2 ) - 10 } \\ { 38 - [ 18 - \{ 20 - ( 16 - 4 \div 2 \times 2 ) \} ] } \\ { 405 - 18 + 7 - 175 \div 5 \times 10 } \end{array} \right.$$
