Ответ:

  1. \(2\sqrt8+\sqrt{18}-\sqrt{50}=4\sqrt2+3\sqrt2-5\sqrt2=2\sqrt2\).
  2. \(\sqrt{150}-\sqrt{54}+\sqrt{24}=5\sqrt6-3\sqrt6+2\sqrt6=4\sqrt6\).
  3. \(4\sqrt2-\sqrt{32}+3\sqrt{128}=4\sqrt2-4\sqrt2+24\sqrt2=24\sqrt2\).
  4. \((\sqrt7+1)^2=7+2\sqrt7+1=8+2\sqrt7\).
  5. \((\sqrt{19}-\sqrt5)(\sqrt{19}+\sqrt5)=19-5=14\).
  6. \((4\sqrt3-1)(4\sqrt3+1)=48-1=47\).