\[\boxed{\mathbf{407}.}\]
\[1)\ x = 11 - 2\sqrt{30} =\]
\[= \sqrt{121} - \sqrt{120} > 0;\]
\[Ответ:\ \ |x| = x.\]
\[2)\ x = 5 - 3\sqrt{3} =\]
\[= \sqrt{25} - \sqrt{27} < 0;\]
\[Ответ:\ \ |x| = - x.\]
\[3)\ x = 10 - 3\sqrt{10} =\]
\[= \sqrt{100} - \sqrt{90} > 0;\]
\[Ответ:\ \ |x| = x.\]