\(a,=15-4+30-11=30\\ b,=\left(\sqrt{5}-1\right)-\left(\sqrt{5}+1\right)=-2\\ c,=8\sqrt{3}-9\sqrt{5}-25\sqrt{3}+10\sqrt{5}=\sqrt{5}-17\sqrt{3}\\ d,=\dfrac{\sqrt{10}\left(\sqrt{2}-\sqrt{5}\right)}{\sqrt{5}-\sqrt{2}}-2\left(\sqrt{10}-3\right)+\dfrac{20\sqrt{10}}{10}-6\\ =\sqrt{10}-2\sqrt{10}+6+2\sqrt{10}-6=\sqrt{10}\\ e,=\sqrt{2\left(2-\sqrt{3}\right)}+\sqrt{\dfrac{2}{2+\sqrt{3}}}+2\\ =\sqrt{4-2\sqrt{3}}+\sqrt{2\left(2+\sqrt{3}\right)}+2\\ =\sqrt{\left(\sqrt{3}-1\right)^2}+\sqrt{4+2\sqrt{3}}+2\\ =\sqrt{3}-1+\sqrt{3}+1+2=2\sqrt{3}+2\)
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