Question

Thực hiện phép tính sau

Answer 1

\(D=\dfrac{3\sqrt{2}+9-3+\sqrt{2}}{\left(3-\sqrt{2}\right)\left(3+\sqrt{2}\right)}\left(3-2\sqrt{2}\right)\\ D=\dfrac{2\left(3+2\sqrt{2}\right)\left(3-2\sqrt{2}\right)}{7}=\dfrac{2\left(9-1\right)}{7}=\dfrac{16}{7}\)