\[1)\ C( - 2;\ - 4),\ \ \ D(4;\ - 12):\]
\[CD = \sqrt{( - 2 - 4)^{2} + ( - 4 + 12)^{2}} =\]
\[= \sqrt{6^{2} + 8^{2}} = \sqrt{36 + 64} =\]
\[= \sqrt{100} = 10.\]
\[Ответ:\ \ 10.\]
\[2)\ C(6;\ 3),\ \ \ D(7;\ - 1):\]
\[CD = \sqrt{(6 - 7)^{2} + (3 + 1)^{2}} =\]
\[= \sqrt{1^{2} + 4^{2}} = \sqrt{17}.\]
\[Ответ:\ \ \sqrt{17}.\]