\[\boxed{\mathbf{660}.}\]
\[y = 3^{x}\]
\[1)\ \sqrt{3} = 3^{\frac{1}{2}} \approx 1,7\]
\[2)\ 3^{\frac{2}{3}} \approx 2\]
\[3)\frac{1}{\sqrt{3}} = 3^{- \frac{1}{2}} \approx - 0,6\]
\[4)\ 3^{- 1,5} \approx 0,2\]