Question

3/ căn 10 + căn40

 

Answer 1

\(\dfrac{3}{\sqrt{10}}+\sqrt{40}\)

\(=\dfrac{3\cdot\sqrt{10}}{\sqrt{10}\cdot\sqrt{10}}+\sqrt{2^2\cdot10}\)

\(=\dfrac{3\sqrt{10}}{10}+2\sqrt{10}\)

\(=\dfrac{3\sqrt{10}+2\sqrt{10}\cdot10}{10}\)

\(=\dfrac{3\sqrt{10}+20\sqrt{10}}{10}\)

\(=\dfrac{23\sqrt{10}}{10}\)

Answer 2

\(=\dfrac{3\sqrt{10}}{10}+2\sqrt{10}=2.3\sqrt{10}\)

Answer 3

3/√10 + √40

= 3√10/10 + 2√10

= 3√10/10 + 20√10/10

= 23√10/10