a,\(\left(\sqrt{2}+2\right)\sqrt{2}-2\sqrt{2}\)
b, \(\sqrt{(\sqrt{5}-\sqrt{10})^2}-\sqrt{10(\sqrt{2+1)}^2}\)
c,\((\sqrt{2}+\sqrt{3})^2.\sqrt{49-20\sqrt{6}}\)
d, \(\dfrac{2}{\sqrt{8-\sqrt{60}}}-\sqrt{\dfrac{\sqrt{18}+\sqrt{27}}{\sqrt{3}+\sqrt{2}}}\)