\[\boxed{\text{6.38.}}\]
\[\textbf{а)}\ N\ (3,5)\ лежит\ левее\ \ \]
\[\text{M\ }(3,8).\]
\[\textbf{б)}\ K\ (0,651)\ лежит\ левее\ \ \]
\[\text{P\ }(0,75).\]
\[\textbf{в)}\ L\ (9,83)\ лежит\ левее\ \]
\[\text{Z\ }(9,9).\]