Ответ:

  1. \(2\sqrt{18}+3\sqrt8+0.4\sqrt{200}=6\sqrt2+6\sqrt2+4\sqrt2=16\sqrt2\).
  2. \(-5\sqrt{27}+2\sqrt{12}-4\sqrt{48}=-15\sqrt3+4\sqrt3-16\sqrt3=-27\sqrt3\).
  3. \(2\sqrt{600}-\sqrt{24}-3\sqrt{54}=20\sqrt6-2\sqrt6-9\sqrt6=9\sqrt6\).
  4. \(-0.5\sqrt{40}+\sqrt{90}+\sqrt{250}=-\sqrt{10}+3\sqrt{10}+5\sqrt{10}=7\sqrt{10}\).
  5. \(0.5\sqrt{20}-0.3\sqrt{45}-0.1\sqrt{500}=\sqrt5-0.9\sqrt5-\sqrt5=-0.9\sqrt5\).
  6. \(-\sqrt{18}+2\sqrt{72}-\sqrt{98}=-3\sqrt2+12\sqrt2-7\sqrt2=2\sqrt2\).
  7. \(\sqrt{63}-4\sqrt{28}+\sqrt{700}=3\sqrt7-8\sqrt7+10\sqrt7=5\sqrt7\).