Question

Thực hiện phép tính :

(\(\sqrt{8}\)- \(3\sqrt{2}\)+ \(\sqrt{10}\)) (\(\sqrt{2}\)- \(3\sqrt{0.4}\))

Answer 1

\(\left(2\sqrt{2}-3\sqrt{2}+\sqrt{10}\right)\left(\sqrt{2}-3\sqrt{0.4}\right)\)

\(=\left(\sqrt{10}-\sqrt{2}\right)\left(\sqrt{2}-3\sqrt{0.4}\right)\)

\(=2\sqrt{5}-6-2+\frac{6\sqrt{5}}{5}\)

\(=\frac{16\sqrt{5}-40}{5}\)

Answer 2

\(=\left(2\sqrt{2}-3\sqrt{2}+\sqrt{10}\right)\left(\sqrt{2}-3\sqrt{0.4}\right)\)

\(=\left(\sqrt{10}-\sqrt{2}\right)\left(\sqrt{2}-3\sqrt{0.4}\right)\)

\(=2\sqrt{5}-6-2+\frac{6\sqrt{5}}{5}=\frac{16\sqrt{5}-40}{5}\)