rút gọn ạ
\(\dfrac{\sqrt{12}-\sqrt{16}}{\sqrt{3}-2}+\dfrac{\sqrt{21}+\sqrt{7}}{\sqrt{3}+1}+\sqrt{\left(2-\sqrt{7}\right)^2}\)
\(\dfrac{9}{\sqrt{10}-1}+\dfrac{5\sqrt{2}-\sqrt{5}}{\sqrt{5}}+\sqrt{11-2\sqrt{10}}\)
\(\dfrac{2}{\sqrt{3}-1}-\sqrt{27}+\left(\sqrt{3}+1\right)^2\)
\(\dfrac{1}{2-\sqrt{2}}-\dfrac{1}{2+\sqrt{2}}+\dfrac{\sqrt{15}-3\sqrt{3}}{3-\sqrt{5}}\)