$$\left. \begin{array} { l } { \frac { 10 ^ { 2 } \times ( - 5 ) ^ { 3 } \times 9 ^ { 0 } } { ( - 1 ) ^ { 5 } \times ( - 2 ) ^ { 2 } ( 5 ) ^ { 4 } } } \\ { n : \quad 10 \times 10 \times 1 } \end{array} \right.$$
$5n$
$$5n$$
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$5,\ n$