$\textit{Đáp án + Giải thích các bước giải:}$
$\text{$\sqrt{\dfrac{(2-\sqrt{3})^2}{75}}$ = $\dfrac{\sqrt{(2-\sqrt{3})^2}}{\sqrt{75}}$ = $\dfrac{\sqrt{(2 - \sqrt{3})^2}}{\sqrt{25}.\sqrt{3}}$ = $\dfrac{2 - \sqrt{3}}{5\sqrt{3}}$}$
$\text{= $\dfrac{(2 - \sqrt{3}) . \sqrt{3}}{5 . \sqrt{3} . \sqrt{3}}$ = $\dfrac{2\sqrt{3} - 3}{5 . 3}$ = $\dfrac{2\sqrt{3} - \sqrt{3} . \sqrt{3}}{15}$ = $\dfrac{\sqrt{3}(2-\sqrt{3})}{15}$}$
