Ответ:

  1. \(\sqrt{0.04\cdot81\cdot25}=0.2\cdot9\cdot5=9\).
  2. \(\sqrt{0.09\cdot16\cdot0.04}=0.3\cdot4\cdot0.2=0.24\).
  3. \(\sqrt{1\frac{7}{9}\cdot\frac{4}{25}}=\sqrt{\frac{16}{9}\cdot\frac{4}{25}}=\frac{8}{15}\).
  4. \(\sqrt{\frac{121}{144}\cdot2\frac{1}{4}}=\sqrt{\frac{121}{144}\cdot\frac{9}{4}}=\frac{11}{8}\).

Ответ: а) 9; б) 0,24; в) \(\frac{8}{15}\); г) \(\frac{11}{8}\).