\[\boxed{\text{6.316.}}\]
\[\textbf{а)}\ 0,104\ :0,13 = 10,4\ :13 = 0,8\ \]
\[\textbf{б)}\ 0,153\ :0,9 = 1,53\ :9 = 0,17\ \]
\[\textbf{в)}\ 42,105\ :3,5 = 421,05\ :35 =\]
\[= 12,03\ \]