Hãy tính: \(0,2\sqrt {{{\left( { - 10} \right)}^2}.3} + 2\sqrt {{{\left( {\sqrt 3 - \sqrt 5 } \right)}^2}}\).

* Hướng dẫn giải

 \(0,2\sqrt {{{\left( { - 10} \right)}^2}.3} + 2\sqrt {{{\left( {\sqrt 3 - \sqrt 5 } \right)}^2}}\)

\(= 0,2\left| { - 10} \right|\sqrt 3 + 2\left| {\sqrt 3 - \sqrt 5 } \right|\)

\(= 2\sqrt 3 + 2\left( {\sqrt 5 - \sqrt 3 } \right)\)

\(= 2\sqrt 3 + 2\sqrt 5 - 2\sqrt 3 = 2\sqrt 5\)