\[\sqrt{20} = \sqrt{4 \cdot 5} = 2\sqrt{5}\]
\[\sqrt{18} = \sqrt{9 \cdot 2} = 3\sqrt{2}\]
\[\sqrt{48} = \sqrt{16 \cdot 3} = 4\sqrt{3}\]
\[\sqrt{50} = \sqrt{25 \cdot 2} = 5\sqrt{2}\]
\[\sqrt{45} = \sqrt{9 \cdot 5} = 3\sqrt{5}\]
\[\sqrt{27} = \sqrt{9 \cdot 3} = 3\sqrt{3}\]
Ответ: 1) 2√5, 2) 3√2, 3) 4√3, 4) 5√2, 5) 3√5, 6) 3√3