Answer
$\frac{1}{x^{4}}$
Work Step by Step
We know that $a^{−n}=\frac{1}{a^{n}}$ and $\frac{1}{a^{-n}}=a^{n}$ (as long as a is a nonzero real number and n is an integer).
Therefore, $\frac{(x^{2})^{3}}{x^{10}}=\frac{x^{2\times3}}{x^{10}}=\frac{x^{6}}{x^{10}}=x^{6-10}=x^{-4}=\frac{1}{x^{4}}$.