§ Задание 291
\[\boxed{\text{4.\ 291}}\]
\[\textbf{а)} - 26 = 1 - 27\]
\[\textbf{б)} - 26 = - 3 - 23\]
\[\textbf{в)} - 26 = - 52 - ( - 26)\]
\[\boxed{\text{4.\ 291}}\]
\[\textbf{а)} - 26 = 1 - 27\]
\[\textbf{б)} - 26 = - 3 - 23\]
\[\textbf{в)} - 26 = - 52 - ( - 26)\]