\[\boxed{\mathbf{129}.}\]
\[1)\ x\sqrt{x - 1} = 0;\ \ \ x \geq 1\]
\[x - 1 = 0;\ \ \ x = 0\]
\[x = 1\]
\[Ответ:x = 1.\]
\[2)\ (x + 3)\sqrt{1 + x} = 0;\ \ \ x \geq - 1\]
\[x + 3 = 0;\ \ \ \ \ 1 + x = 0\]
\[x = - 3\ \ \ \ \ \ \ \ \ \ \ x = - 1.\]
\[Ответ:x = - 1.\]