Question

Решите пожалуйста В-Е

Answer 1

$\tt 1) \ \ (2\sqrt{2}-\sqrt{50})\cdot \sqrt{2}=(2\sqrt{2}-5\sqrt{2})\cdot \sqrt{2}=-3\sqrt{2}\cdot\sqrt{2}=-6\\\\ 2) \ \ (4\sqrt{80}-\sqrt{125}): \sqrt{5}=(16\sqrt{80}-5\sqrt{5}): \sqrt{5}=11\sqrt{5}:\sqrt{5}=11\\\\3) \ \ 6\sqrt{x} -\frac{2}{3}\sqrt{9x} +10\sqrt{\frac{x}{4}} =6\sqrt{x} -2\sqrt{x} +10\frac{\sqrt{x} }{2} =4\sqrt{x}+5\sqrt{x}=9\sqrt{x} \\\\ 4) \ \ (\sqrt{ab}+\sqrt{b} ):\sqrt{b}=\sqrt{b}(\sqrt{a}+1):\sqrt{b}=\sqrt{a}+1$