17: \(=2\cdot7\sqrt{3}-\dfrac{3}{32}\cdot8\sqrt{3}+\dfrac{4}{18}\cdot9\sqrt{3}-\dfrac{1}{10}\cdot10\sqrt{3}\)
\(=14\sqrt{3}-\dfrac{3}{4}\sqrt{3}+2\sqrt{3}-\sqrt{3}\)
\(=\dfrac{57}{4}\sqrt{3}\)
18: \(=-\dfrac{1}{2}\cdot6\sqrt{3}+\dfrac{1}{15}\cdot5\sqrt{3}-\dfrac{1}{22}\cdot11\sqrt{3}+2\sqrt{3}\)
\(=-3\sqrt{3}+\dfrac{1}{3}\sqrt{3}-\dfrac{1}{2}\sqrt{3}+2\sqrt{3}\)
\(=-\dfrac{7}{6}\sqrt{3}\)
19: \(=\dfrac{5}{8}\cdot4\sqrt{3}-\dfrac{1}{33}\cdot11\sqrt{3}+\dfrac{3}{14}\cdot7\sqrt{3}-\dfrac{1}{4}\cdot8\sqrt{3}\)
\(=\dfrac{5}{2}\sqrt{3}-\dfrac{1}{3}\sqrt{3}+\dfrac{3}{2}\sqrt{3}-2\sqrt{3}\)
\(=\dfrac{5}{3}\sqrt{3}\)
20: \(=\dfrac{3}{2}\cdot2\sqrt{3}+\dfrac{7}{5}\cdot5\sqrt{3}-\dfrac{9}{10}\cdot10\sqrt{3}+\dfrac{11}{6}\cdot6\sqrt{3}\)
\(=3\sqrt{3}+7\sqrt{3}-9\sqrt{3}+11\sqrt{3}=12\sqrt{3}\)
