Question

Answer 1

=\(\sqrt{\dfrac{1}{100}}-\sqrt{\dfrac{16}{100}}+\sqrt{\dfrac{1}{4}}\)=\(\dfrac{1}{10}-\dfrac{4}{10}+\dfrac{1}{2}\)

=\(\dfrac{-3}{10}+\dfrac{5}{10}=\dfrac{2}{10}=\dfrac{1}{5}\)

Answer 2

Ta có: \(\left(\sqrt{\dfrac{1}{5}}-\sqrt{\dfrac{16}{5}}+\sqrt{5}\right):\sqrt{20}\)

\(=\left(\dfrac{1}{5}\sqrt{5}-\dfrac{4}{5}\sqrt{5}+\sqrt{5}\right):2\sqrt{5}\)

\(=\dfrac{\dfrac{7}{5}\sqrt{5}}{2\sqrt{5}}=\dfrac{7}{10}\)