\[\sqrt{\left( 3x^{2} - 10x + 3 \right)^{- 1}} =\]
\[= \frac{1}{\sqrt{3x² - 10x + 3}}\]
\[ООФ:\ \ 3x^{2} - 10x + 3 > 0\]
\[D = 100 - 36 = 64\]
\[x_{1} = \frac{10 + 8}{6} = 3;\ \ \ \ \ \]
\[x_{2} = \frac{10 - 8}{6} = \frac{1}{3}.\]
\[Ответ:при\ \left( - \infty;\frac{1}{3} \right) \cup (3; + \infty).\]