\[\boxed{\mathbf{638.}ОК\ ГДЗ\ –\ домашка\ на\ 5}\]
\[\textbf{а)}\ плоскость\ Oxz:\]
\[A_{1}(2;0;5);\ \ B_{1}\left( 3;0;\frac{1}{2} \right);\]
\[C_{1}\left( - \sqrt{3};0;\sqrt{5} - \sqrt{3} \right).\]
\[плоскость\ Oxy:\]
\[A_{2}(2; - 3;0);B_{2}(3; - 5;0);\]
\[C_{2}\left( - \sqrt{3}; - \frac{\sqrt{2}}{2};0 \right).\]
\[плоскость\ Oyz:\]
\[A_{3}(0; - 3;5);B_{3}\left( 0; - 5;\frac{1}{2} \right);\]
\[C_{3}\left( 0; - \frac{\sqrt{2}}{2};\sqrt{5} - \sqrt{3} \right).\]
\[\textbf{б)}\ ось\ Ox:\]
\[A_{4}(2;0;0);\ \ B_{4}(3;0;0);\ \ \]
\[C_{4}\left( - \sqrt{3};0;0 \right).\]
\[ось\ Oy:\]
\[A_{5}(0; - 3;0);\ \ B_{5}(0; - 5;0);\ \ \]
\[C_{5}\left( 0; - \frac{\sqrt{2}}{2};\ 0 \right).\]
\[ось\ Oz:\]
\[A_{6}(0;0;5);\ \ B_{6}\left( 0;0;\frac{1}{2} \right);\ \ \]
\[C - 6\ \left( 0;0;\sqrt{5} - \sqrt{3} \right).\]