\[\boxed{\text{6.1.}}\]
\[\textbf{а)}\ 3\frac{7}{10} = 3,7;\ \]
\[\textbf{б)}\ 9\frac{6}{10} = 9,6;\ \]
\[\textbf{в)}\ 27\frac{27}{100} = 27,27;\ \]
\[\textbf{г)}\ 99\frac{5}{100} = 99,05;\ \]
\[\textbf{д)}\ 2\frac{1}{100} = 2,01;\ \]
\[\textbf{е)}\ 10\frac{1}{10} = 10,1;\ \]
\[\textbf{ж)}\ 7\frac{666}{1\ 000} = 7,666;\ \]
\[\textbf{з)}\ 5\frac{75}{1\ 000} = 5,075;\ \]
\[\textbf{и)}\ 75\frac{8}{10\ 000} = 75,0008;\ \]
\[к)\ 4\frac{278}{10\ 000} = 4,0278.\ \ \ \]