\[\boxed{\mathbf{14}\mathbf{.}}\]
\[\textbf{а)}\ 22 + (11 - 5) = 22 + 6 = 28\]
\[66 - (12 - 6) = 66 - 6 = 60\]
\[20 - 2 + 30 = 18 + 30 = 48\]
\[\textbf{б)}\ 78 + (20 - 18) = 78 + 2 =\]
\[= 80\]
\[40 - 34 + 94 = 6 + 94 = 100\]
\[100 - (60 - 3) = 100 - 57 = 43\]
\[100 - 2 \cdot 2 = 100 - 4 = 96\]
\[2 \cdot 7 + 86 = 14 + 86 = 100\]
\[80 - 2 \cdot 8 = 80 - 16 = 64\]