\[\boxed{\mathbf{1}\mathbf{.91}}\]
\[\textbf{а)}\ 43 \cdot 13 + 316 = 875\]
\[\textbf{б)}\ (63 + 59) \cdot 75 = 122 \cdot 75 =\]
\[= 9150\]
\[\textbf{в)}\ 12\ 255\ :43 + 174 = 459\]
\[\textbf{г)}\ 53\ 064\ :(18 + 48) =\]
\[= 53\ 064\ :66 = 804\]