Ответ:

  1. \(\sqrt{a-b}=\sqrt{0,93-0,57}=\sqrt{0,36}=0,6\).
  2. \(\sqrt{a-b}=\sqrt{\frac{3}{4}-\left(-\frac{1}{18}\right)}=\sqrt{\frac{3}{4}+\frac{1}{18}}=\sqrt{\frac{29}{36}}=\frac{\sqrt{29}}{6}\).

Ответ: 1) 0,6; 2) \(\frac{\sqrt{29}}{6}\).