\[\boxed{\text{6.391.}}\]
\[\textbf{а)}\ 0,468\ :0,26 = 46,8\ :26 = 1,8\ \]
\[\textbf{б)}\ 0,9775\ :0,425 =\]
\[= 977,5\ :425 = 2,3\ \]
\[\textbf{в)}\ 3,648\ :4,56 = 364,8\ :456 =\]
\[= 0,8\ \]
\[\textbf{г)}\ 0,559\ :0,043 = 559\ :43 = 13\ \]
\[\textbf{д)}\ 50,02\ :41 = 1,22\ \]
\[\textbf{е)}\ 142,4\ :178 = 0,8\ \]