$\sqrt{25}=5\left(bo{5}^2=25\right)$   

$\sqrt[3]{64}=4\left(bo{4}^3=64\right)$  

$\sqrt{0,25}=0,5\left(bo{0,5}^2=0,25\right)$   

$\sqrt[3]{-64}=-4\left(bo{\left(-4\right)}^3=-64\right)$   

$\sqrt{\frac{25}{49}}=\frac{5}{7}\left(bo{\left(\frac{5}{7}\right)}^2=\frac{25}{49}\right)$   

$\sqrt[3]{\frac{8}{125}}=\frac{2}{5}\left(bo{\left(\frac{2}{5}\right)}^3=\frac{8}{125}\right)$  

$\sqrt{3\frac{1}{16}}=\sqrt{\frac{49}{16}}=\frac{7}{4}\left(bo{\left(\frac{7}{4}\right)}^2=\frac{49}{16}\right)$   

$\sqrt[3]{1\frac{61}{64}}=\sqrt[3]{\frac{125}{64}}=\frac{5}{4}\left(bo{\left(\frac{5}{4}\right)}^3=\frac{125}{64}\right)$