Ответ:

  1. а) \(\sqrt{4^2+36}=\sqrt{16+36}=\sqrt{52}=2\sqrt{13}\).
    б) \(\sqrt{4\cdot5^3-6^3}=\sqrt{4\cdot125-216}=\sqrt{284}=2\sqrt{71}\).
    в) \(\sqrt{0.4^2-0.11}=\sqrt{0.16-0.11}=\sqrt{0.05}=\frac{\sqrt{5}}{10}\).
    г) \(\sqrt{0.6^2-0.3^2}=\sqrt{0.36-0.09}=\sqrt{0.27}=\frac{3\sqrt{3}}{10}\).

Ответ: а) \(2\sqrt{13}\); б) \(2\sqrt{71}\); в) \(\frac{\sqrt{5}}{10}\); г) \(\frac{3\sqrt{3}}{10}\).