\[\boxed{\text{220}\text{\ (220)}\text{.}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[1)\ 0,5\sqrt{24} - 4\sqrt{40} - \sqrt{150} +\]
\[+ \sqrt{54} + \sqrt{1000} =\]
\[= 0,5 \cdot 2\sqrt{6} - 4 \cdot 2\sqrt{10} -\]
\[- 5\sqrt{6} + 3\sqrt{6} + 10\sqrt{10} =\]
\[= \sqrt{6} - 8\sqrt{10} - 2\sqrt{6} + 10\sqrt{10} =\]
\[= - \sqrt{6} + 2\sqrt{10}.\]
\[2)\ \sqrt{8b} + 0,3\sqrt{50b} - 3\sqrt{2b} =\]
\[= 2\sqrt{2b} + 0,3 \cdot 5\sqrt{2b} - 3\sqrt{2b} =\]
\[= 2\sqrt{2b} + 1,5\sqrt{2b} - 3\sqrt{2b} =\]
\[= 0,5\sqrt{2b}.\]
\[3)\ 1,5\sqrt{72} - \sqrt{216} - 0,6\sqrt{450} +\]
\[+ 0,5\sqrt{96} = 1,5 \cdot 6\sqrt{2} - 6\sqrt{6} -\]
\[- 0,6 \cdot 5 \cdot 3\sqrt{2} +\]