\[\boxed{\mathbf{Страница}\mathbf{\ 50}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[\boxed{\mathbf{176}\mathbf{.}\mathbf{\ }}\]
\[\boxed{\mathbf{177}\mathbf{.}\mathbf{\ }}\]
\[1)\ (5 + 3) \cdot 7 = 8 \cdot 7 = 56\]
\[2)\ 20 + 6 \cdot 4 = 20 + 24 = 44\]
\[3)\ 8 \cdot (4 + 5) = 8 \cdot 9 = 72\]
\[4)\ (90 - 50)\ :8 = 40\ :8 = 5\]