\[\boxed{\mathbf{1.}}\]
\[\textbf{а)}\]
\[\textbf{б)}\ \]
\[\boxed{\mathbf{2.}}\]
\[\textbf{а)}\]
\[Проверка:\]
\[\textbf{б)}\]
\[Проверка:\]
\[\boxed{\mathbf{3.}}\]
\[(75 - 48)\ :9 = 27\ :9 =\]
\[= 3\ (порции) - пельменей\ \]
\[получилось.\]
\[Ответ:3\ порции.\]
\[\boxed{\mathbf{4.}}\]
\[\textbf{а)}\ 260\ 768\ :32 = 8149\]
\[\textbf{б)}\ 43\ 213\ :547 = 79\]
\[\textbf{в)}\ 341\ 776\ :4168 = 82\]
\[\textbf{г)}\ 2\ 287\ 239\ :57 = 40\ 127\]