Ответ:

  1. \(\sqrt{64\cdot36}=8\cdot6=48\).

  2. \(\sqrt{0.04\cdot81}=0.2\cdot9=1.8\).

  3. \(\sqrt{324\cdot0.25}=18\cdot0.5=9\).

  4. \(\sqrt{0.01\cdot0.04\cdot121}=0.1\cdot0.2\cdot11=0.22\).

  5. \(\sqrt{\frac{25}{81}}=\frac{5}{9}\).

  6. \(5\frac{1}{16}=\frac{81}{16}\), поэтому \(\sqrt{5\frac{1}{16}}=\frac{9}{4}=2\frac{1}{4}\).

Ответ: 1) 48; 2) 1,8; 3) 9; 4) 0,22; 5) 5/9; 6) 2 1/4.