Answer
$n^2-18n+3$
Work Step by Step
$(n^5 - 18n^4 + 3n^3) \div n^3$ = $\frac{n^5}{n^3} - \frac{18n^4}{n^3} + \frac{3n^3}{n^3}$= $n^2-18n+3$
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