Answer
$625m^4/a^{12}$
Work Step by Step
$(a^3/5m)^{-4}$
$((1/a^3)/(1/5m))^4$
$((1/a^3)*a^3/(1/5m)*a^3)^4$
$1/(a^3/5m)^4$
$1*5m/(a^3*5m/5m)^4$
$(5m/a^3)^4$
$625m^4/a^{12}$
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