\(\left(-4\sqrt{20}+5\sqrt{500}-3\sqrt{45}\right):\sqrt{5}\) = ?
33. -33. \(3\sqrt{11}\). \(11\sqrt{3}\). Hướng dẫn giải:\(\left(-4\sqrt{20}+5\sqrt{500}-3\sqrt{45}\right):\sqrt{5}\)\(=\dfrac{-4\sqrt{20}}{\sqrt{5}}+\dfrac{5\sqrt{500}}{\sqrt{5}}-\dfrac{3\sqrt{45}}{\sqrt{5}}\)\(=-4.\sqrt{\dfrac{20}{5}}+5\sqrt{\dfrac{500}{5}}-3\sqrt{\dfrac{45}{5}}\)
\(=-4.\sqrt{4}+5\sqrt{100}-3\sqrt{9}\)\(=-4.2+5.10-3.3=33\)
