1)\begin{equation}\sqrt{64} да
\end{equation}
2)\begin{equation}-\sqrt{4} да
\end{equation}
3)\begin{equation}\sqrt{-9} нет
\end{equation}
4)\begin{equation}\sqrt{\left ( -0,5 \right )^{2}} \sqrt{0,25} да
\end{equation}
5)\begin{equation}\sqrt{0} да
\end{equation}
6)\begin{equation}\sqrt{5} да
\end{equation}
