Đáp án:
$\dfrac{9}{5}$
Giải thích các bước giải:
$\bigg(\sqrt[]{\dfrac{1}{5}}+$ $\sqrt[]{\dfrac{9}{5}}+$ $\sqrt[]{5}\bigg):$ $\sqrt[]{5}$
$=\bigg(\sqrt[]{\dfrac{1^2}{5}}+$ $\sqrt[]{\dfrac{3^2}{5}}+$ $\sqrt[]{5}\bigg):$ $\sqrt[]{5}$
$=\bigg(\dfrac{1+3+5}{\sqrt[]{5}}\bigg).$ $\bigg(\dfrac{1}{\sqrt[]{5}}\bigg)$
$=\bigg(\dfrac{9}{\sqrt[]{5}}\bigg).$ $\bigg(\dfrac{1}{\sqrt[]{5}}\bigg)$
$=\dfrac{9}{5}$
