Question

Answer 1

Thực hiện phép tính sau

Answer 2

\(=2\sqrt{10}+6+2\sqrt{10}-6=4\sqrt{10}\)

Answer 3

\(=\dfrac{2\left(\sqrt{10}+3\right)+2\left(\sqrt{10}-3\right)}{\left(\sqrt{10}-3\right)\left(\sqrt{10}+3\right)}=4\sqrt{10}\)

Answer 4

\(4\sqrt{10}\)