c: \(\sqrt5-\sqrt{48}+5\cdot\sqrt{27}-\sqrt{45}\)
\(=\sqrt5-4\sqrt3+5\cdot3\sqrt3-3\sqrt5\)
\(=-2\sqrt5-4\sqrt3+15\sqrt3=-2\sqrt5+11\sqrt3\)
d: \(\frac{5\sqrt2-2\sqrt5}{\sqrt5-\sqrt2}+\frac{6}{2-\sqrt{10}}-\frac{20}{\sqrt{10}}\)
\(=\frac{\sqrt{10}\left(\sqrt5-\sqrt2\right)}{\sqrt5-\sqrt2}-\frac{6}{\sqrt{10}-2}-2\sqrt{10}\)
\(=\sqrt{10}-\frac{6\left(\sqrt{10}+2\right)}{10-4}-2\sqrt{10}=-\sqrt{10}-\left(\sqrt{10}+2\right)\)
\(=-2\sqrt{10}-2\)
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