$$\left. \begin{array} { l } { ( - 17 ) \times 10 ( - 1 ) } \\ { ( - 23 ) \times 100 \times ( - 10 ) } \\ { 29 \times - 50 \times ( - 200 ) } \\ { ( - 4 ) \times 25 \times ( 400 ) } \end{array} \right.$$
