\[\boxed{\text{600\ (600).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[Формула\ квадрата\ трехчлена:\]
\[(a + b + c)^{2} =\]
\[= a^{2} + b^{2} + c^{2} + 2ab + 2bc + 2ac.\]
\[Выведем:\]
\[(a + b + c)^{2} =\]
\[= \left( (a + b) + c \right)^{2} =\]
\[= (a + b)^{2} + 2 \cdot (a + b) \cdot c + c^{2} =\]
\[1)\ (a + b - c)^{2} =\]
\[2)\ (a - b + 4)^{2} =\]
\[= a^{2} + b^{2} + 16\ - 2ab - 8b + 8a.\]