\[\boxed{\mathbf{609\ (609).\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[= \sqrt{\left( \sqrt{a} + 6 \right)^{2}} - \sqrt{\left( \sqrt{a} - 6 \right)^{2}} =\]
\[= |\sqrt{a} + 6| - |\sqrt{a} - 6|\]
\[при\ a > 36:\]
\[\sqrt{a} + 6 - \sqrt{a} + 6 = 12.\]
\[при\ \ 0 \leq a \leq 36:\]
\[\sqrt{a} + 6 - 6 + \sqrt{a} = 2\sqrt{a}.\]
\[\boxed{\mathbf{60}\mathbf{9}\mathbf{\text{.\ }}Еуроки\ - \ ДЗ\ без\ мороки}\]
\[y = \sqrt{x}\]
\[1)\ y = \sqrt{0,16} = 0,4;\ \ \ \ \ \]
\[y = \sqrt{64} = 8;\ \ \ \ \ \]
\[y = \sqrt{1,44} = 1,2\]
\[y = \sqrt{3600} = 60.\]
\[2)\ 0,2 = \sqrt{x};\ \ \ x = 0,04;\ \ \ \ \]
\[5 = \sqrt{x};\ \ \ \ \ x = 25\]
\[120 = \sqrt{x};\ \ \ \ \ x = \sqrt{14400};\ \ \ \ \]
\[- 4 = \sqrt{x} \Longrightarrow нет\ таких\ x\text{.\ }\]