Ответ:

  1. \(\sqrt{9\cdot64\cdot0.25}=\sqrt{144}=12\).
  2. \(\sqrt{1.21\cdot0.09\cdot0.0001}=1.1\cdot0.3\cdot0.01=0.0033\).
  3. \(\sqrt{\frac{25}{81}\cdot\frac{16}{49}\cdot\frac{196}{9}}=\frac{5}{9}\cdot\frac{4}{7}\cdot\frac{14}{3}=\frac{40}{27}\).
  4. \(\sqrt{5\frac{1}{16}\cdot2\frac{34}{81}}=\sqrt{\frac{81}{16}\cdot\frac{196}{81}}=\sqrt{\frac{49}{4}}=\frac{7}{2}\).

Ответ: а) 12; б) 0,0033; в) \(\frac{40}{27}\); г) \(\frac{7}{2}\).