\(a,=\left(5\sqrt{11}+7\sqrt{11}+3\sqrt{11}\right):5\sqrt{11}=15\sqrt{11}:5\sqrt{11}=3\\ b,=\dfrac{\sqrt{6}\left(5+\sqrt{6}\right)}{4\sqrt{6}}=\dfrac{5+\sqrt{6}}{4}\\ c,=\sqrt{\left(\sqrt{3}+\sqrt{2}\right)^2}+\sqrt{\left(\sqrt{3}-\sqrt{2}\right)^2}=2\sqrt{3}\)