Ответ:

  1. \(\sqrt9=3\).
  2. \(\sqrt{100}=10\).
  3. \(\sqrt{289}=17\).
  4. \(\sqrt{6400}=80\).
  5. \(\sqrt{45}=3\sqrt5\).
  6. \(\sqrt{32}=4\sqrt2\).
  7. \(\sqrt{0.36}=0.6\).
  8. \(\sqrt7\cdot\sqrt7=7\).
  9. \(\sqrt{50}\cdot\sqrt2=\sqrt{100}=10\).
  10. \(\sqrt{1.6}=\sqrt{16/10}=2\sqrt{10}/5\).
  11. \((\sqrt6)^2=6\).
  12. \((2\sqrt{11})^2=4\cdot11=44\).
  13. \(\sqrt{2250}=15\sqrt{10}\).
  14. \(\sqrt{64+16}=\sqrt{80}=4\sqrt5\).
  15. \(\sqrt{64\cdot16}=\sqrt{1024}=32\).
  16. \(\sqrt{17^2-8^2}=\sqrt{289-64}=\sqrt{225}=15\).
  17. \((\sqrt6)^3=6\sqrt6\).
  18. \(3/\sqrt3=\sqrt3\).
  19. По формуле разности квадратов: \((3-\sqrt2)(3+\sqrt2)=9-2=7\).
  20. \((\sqrt3+2)^2=3+4\sqrt3+4=7+4\sqrt3\).