\[\boxed{\mathbf{852}.}\]
\[1)\log_{x^{2}}9 + \log_{\sqrt{x}}4 = 2\ \]
\[\log_{x}3 + \log_{x}16 = 2\]
\[\log_{x}(3 \cdot 16) = 2\]
\[\log_{x}48 = 2\]
\[x^{2} = 48\]
\[x = \sqrt{48} = 4\sqrt{3}.\]
\[Ответ:x = 4\sqrt{3}.\]
\[2)\log_{x^{2}}16 - \log_{\sqrt{x}}7 = 2\]
\[\log_{x}4 - \log_{x}49 = 2\]
\[\log_{x}\frac{4}{49} = 2\]
\[x^{2} = \frac{4}{49}\]
\[x = \frac{2}{7}.\]
\[Ответ:x = \frac{2}{7}.\]