Ответ:

  1. \(7-\sqrt{25}=7-5=2\).
  2. \(\sqrt{16}-9=4-9=-5\).
  3. \(4\cdot\sqrt{0.01}=4\cdot0.1=0.4\).
  4. \(\frac{1}{3}\cdot\sqrt{0.81}=\frac{1}{3}\cdot0.9=0.3\).
  5. \(0.25\cdot\sqrt{0.25}=0.25\cdot0.5=0.125\).

Ответ: 1) 2; 2) −5; 3) 0,4; 4) 0,3; 5) 0,125.