Ответ:

  1. \((2\sqrt{5})^2=2^2\cdot(\sqrt{5})^2=4\cdot5=20\).

    \(\frac{20}{160}=\frac18\).

  2. \((4\sqrt{2})^2=4^2\cdot(\sqrt{2})^2=16\cdot2=32\).

    \(\frac{96}{32}=3\).

Ответ: а) \(\frac18\); б) 3.