Ответ:

  1. а) \(\frac{\sqrt{1.2\cdot2.7}}{\sqrt{0.84}}=\sqrt{\frac{3.24}{0.84}}=\sqrt{\frac{27}{7}}=\frac{3\sqrt{21}}7\).
  2. б) \(\frac{\sqrt{4.5\cdot7.5}}{\sqrt{2.4}}=\sqrt{\frac{33.75}{2.4}}=\sqrt{\frac{225}{16}}=\frac{15}{4}\).

Ответ: а) \(\frac{3\sqrt{21}}7\); б) \(\frac{15}{4}\).