\[\boxed{\mathbf{Страница\ 80.}}\]
\[\boxed{\mathbf{175.}}\]
\[Ответ:3.\]
\[\boxed{\mathbf{176.}}\]
\[A2 = 6;\ \ B2 = (6 + 4)\ :2 = 5;\]
\[C1 = 6 - 5 = 1;\ \ C2 = 4.\]
\[Ответ:4.\]
\[\boxed{\mathbf{177.}}\]
\[= A2 + B2.\]
\[Ответ:2.\]