\[\boxed{\mathbf{3.}\mathbf{267}}\]
Пояснение.
Решение.
\[\textbf{а)}\ 56 - 29 + 23 - 27 = 23\]
\[1)\ 56 - 29 = 27\]
\[2)\ 27 + 23 = 50\]
\[3)\ 50 - 27 = 23\]
\[\textbf{б)}\ 165 + 308 - 75 - 153 = 245\]
\[1)\ 165 + 308 = 473\]
\[2)\ 473 - 153 = 320\]
\[3)\ 320 - 75 = 245\]
\[\textbf{в)}\ 34 \cdot 35\ :85 \cdot 3 = 14 \cdot 3 = 42\]
\[\textbf{г)}\ 1088\ :136 \cdot 25\ :20 =\]
\[= 8 \cdot 25\ :20 = 200\ :20 = 10\]
\[\textbf{д)}\ 11 \cdot 45 - 224\ :14 - 336\ :8 =\]
\[= 495 - 16 - 42 = 479 - 42 =\]
\[= 437\]
\[\textbf{е)}\ 442\ :34 \cdot 60 - 256 \cdot 9\ :96 =\]
\[= 780 - 24 = 756\]
\[13 \cdot 60 = 780\]