\[\boxed{\text{22\ (22).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[m - n = 5;\ \ \ k = - 2\]
\[1)\ (n - m) \cdot k = - (m - n) \cdot k =\]
\[= - 5 \cdot ( - 2) = 10\]
\[2)\ 2m - 2n + 3k =\]
\[= 2 \cdot (m - n) + 3k =\]
\[= 2 \cdot 5 + 3 \cdot ( - 2) = 10 - 6 = 4\]