Ответ:

  1. а) \(2\sqrt{64}+\sqrt{25}=2\cdot8+5=21\).
  2. б) \(\sqrt{81}-\frac{1}{3}\sqrt{144}=9-\frac{1}{3}\cdot12=5\).
  3. в) \(\frac{1}{\sqrt{0.0025}}=\frac{1}{0.05}=20\).
  4. г) \(\frac{1}{\sqrt{0.04}}+5\sqrt{0.16}=5+5\cdot0.4=7\).
  5. д) \(-\sqrt{\frac{16}{25}}-\frac{3}{7}\sqrt{1\frac{24}{25}}=-\frac45-\frac37\cdot\frac75=-\frac45-\frac35=-\frac75\).
  6. е) \(\frac{0.1\sqrt{81}}{\sqrt{100}}=\frac{0.1\cdot9}{10}=0.09\).
  7. ж) \(15\sqrt{\frac{49}{81}}\sqrt{\frac{9}{25}}=15\cdot\frac79\cdot\frac35=7\).
  8. з) \(\frac{\sqrt{0.01}}{\sqrt{0.0001+0.0009}}=\frac{0.1}{\sqrt{0.001}}=\sqrt{10}\).
  9. и) \(-\frac{\sqrt{2.25}}{3\sqrt{0.04}}=-\frac{1.5}{3\cdot0.2}=-2.5\).