\[\boxed{\text{385\ (385).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[Используем\ таблицу\ квадратов.\]
\[\textbf{а)}\ 34^{2} - 175 = 1156 - 175 =\]
\[= 981\]
\[\textbf{б)}\ 605 + 78^{2} = 605 + 6084 =\]
\[= 6689\]
\[\textbf{в)}\ 42^{2} \cdot 9 = 1764 \cdot 9 = 15\ 876\]
\[\textbf{г)}\ 18^{2}:27 = 324\ :27 =\]
\[= (270 + 54)\ :27 = 10 + 2 =\]
\[= 12\]
\[\textbf{д)}\ 75^{2} + 25^{2} = 5625 + 625 =\]
\[= 6250\]
\[\textbf{е)}\ 59^{2} - 36^{2} = 3481 - 1296 =\]
\[= 2185\]