Ответ:

  1. \(d_{AB}=\sqrt{(5-2)^2+(5-1)^2}=\sqrt{9+16}=5\).
  2. \(d_{AB}=\sqrt{(6-0)^2+(8-0)^2}=\sqrt{36+64}=10\).
  3. \(d_{AB}=\sqrt{(3-(-1))^2+(5-2)^2}=\sqrt{16+9}=5\).
  4. \(d_{AB}=\sqrt{(7-2)^2+(3-(-2))^2}=\sqrt{25+25}=5\sqrt{2}\).
  5. \(d_{AB}=\sqrt{(-1-(-4))^2+(3-(-1))^2}=\sqrt{9+16}=5\).