Решение:
\[ (2-c)(c-2) = -(c-2)(c-2) = -(c-2)^2 \]
\[ -(c^2 - 4c + 4) = -c^2 + 4c - 4 \]
\[ (-c^2 + 4c - 4) + c^2 + 2 \]
\[ (-c^2 + c^2) + 4c + (-4 + 2) = 4c - 2 \]
\[ 4(0.5) - 2 = 2 - 2 = 0 \]
Ответ: 0